小升初真题--四则混合运算380题模板
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小升初真题混合运算专项练习(有答案)
3. ( 2012?武胜县)计算,能简算的要简
算.
2004+75X 54 - 45
(0.125 X 8 - 0.5 )X 4
② 127X 8- 127 X &
2. (2012?武胜县)计算. 9080 - 35 X 26
17-3.4+1.48
f ( i4)X(知
1110-[56 X(上-卫)]
7 S
4. (2012?武胜县)计算. (108-25)X( 75- 18)
1. (2012?瑶海区)基本计算:
① 428 - [32 -( 4+4)]
32% X 76.4+1.36 X 3.2
心谱-(气)].
3.5 X( 20.6 - 16.8 -
4.8 )
(d-_^)X
2 6
⑦ 36X(1 +1)
6 3
7. (2012?天柱县)脱式计算.
3060 - 15 - 25 X 1.04
8.(2012?桃源县)脱式计算.
99 X 87+87
④[匸4-T 118.7 - 3.375 - 6.625
丄X [7 - 4 -
5. (2012?万州区) 9 - 5.4= 780 计算:
-26=
3.14 X 3= 27
625 - 199= 10+0.1 =
9.42 X 0.1 =
0.4
1十
11
6. (2012?桐庐县)
①92X13+28
-卫+2
7 7 计算.
②4.2 - 1.5 - 0.36 ⑥2 -
15 9
2X ( 3. 5兰 X(卫+0.5 )+ 2
丄
4
存[(号音 ②5+ 9+里x !
7
④丄+[2 -(
11
5
9.( 2012?苏州) ①630 + 18X 24 计算下面各题,能简算的要简算.
② 0.7+3.9+4.3+6.1 11. (2012?泉州)用递等式计算
(1)
1379+450+18X 40 ③ 16X 2+4X Z 5 5 (2) (3.2 十 16+10.8 )+
22
®( 7.5 - 7.5X 0.6)+ 4 訝+(*
1)
(2012?硚口
区) 10. (2012?顺昌县)脱式计算.(能简算的要简算)
① 14X 75 - 624 + 39
12. 简算)
800 - 608 + 32 X 5
脱式计算.(友情提醒:有的可以
3.42 X 76.3+76.3 X 5.76+9.18 X 23.7.
14.( 2012?洪山区)能简便的要用简便方法计算,写
出主要过程
13.( 2012?吉水县)脱式计算,能简算的要简算. 97 - 1+35.6+0 X 6
48 X 9.9+48 X 0.1
(1) 360+240 - 15X 28
(2) 6-2.4 - 0.3X
1.4
(6- 6X 2)十 12.
3
—X 6+6 X-
7 7
1375+450 - 15X 25 [4.5+ (13Xd+13Xd)] E E 48 X —+48 X —+48 X 8 16 16 94.47 -( 94.47 -
86.555)
(孑0.4心舟浮
15. (2012?凤阳县)用递等式计算,能简算的要简算 (1) (2)
43 X 8 - 420 -
15
^+^-+1+3-^ 4 17 4 17
3.68 - 3.6X 0.2+0.18
16. (2011?漳州)计算下面各题,怎样简便就怎样计
算.
420- 216- 18X 17
18. ( 2011?永州)下面各题,怎样简便就怎样计算. 405 X ( 20 - 172-43)
25X 12.5X 32
2x JL +JL d
6 12 12 5 iV
[ x(
r 詁.
17. ( 2011?游仙区)用自己喜欢的方法算
(315+285)-( 315 - 255)
360- 225- 15X 18
(6)
(M )^-11
2 3 5 IS
5 -(5」+JL )
7 14 13
3.9 X 9.77+0.23 X 3.9
(土+土-Ji )x 36
4 6 3
1H )X
1.
3.3 x E +0.75 X 3.7+75%X 3.
4
17.31 - 6.15 - 3.85
19.( 2011?武昌区)递等式计算:
20.( 2011?田东县)计算下列各题. 860 - 560- 8X 7
23.( 2011?金堂县)用自己喜欢的方式计算下面各题 (要
写出主要的解答过程)
(1)
字卫X 卫
"15
4.72 - 1.16 - 2.84
(4) i ) 卫+』-
6 S 12
22. 算的要写出主要简算过
程)
109X x+109 X x
(2011?南县) F 面各题,能简算的要简算.
(能
简 (5.9+1.65)- 2.5 (XJ )X 20 十里
4 5
21
9.5-( 4.6+5.8)- 1.3
(2) 64 - 15.8 -
14.2
21 .( 2011?瑞安市) (1) 360+24- 15X 30 (56Xy-27) X 吕
(2) 0.25 X 7.2+2.8 - 0.5
3600 - 800 - 40 X 35
[1 -(丄 +5)].
2 3 9
26. (2011?河池)用你喜欢的方法计
算.
25 X 12 - 850 - 17
(6) 38 - [2.5 X
(4.36+3.64 )]
.
27. (2011?海州区)神机妙算: 2842 - 14+74X 3
聖(5-3
9
6 4
25. (2011?河西区)脱式计算. 0.25 X 99+25%
24.( 2011?淮南) 计算过程). 6760 - 13+17X 21 选择合适的方法计算(要写出主要的 3.33 X 4.5+4.5 X 6.67 (
)X 13+4 - 17.
(能简算的要简算)
3.6 X 99+3.6
1.65 X 45+55 X 1.65
53X13+21
6+1 亠 5
7 7 4
72 X(总-_L )
9 12
28. (2011?丰都县)脱式计算 (384+336)+ 15X 13
(丄X 」)
5 S
3.84 +5.16
4
30. (2010?雨花区)计算下列各题,能简便的要简便计
算
3618+45+1620
(11+30.6)+ 16+16.5
67 - 67X( 23+19)
2 -总 X _L -
-1
200.8 X 73 - 6.3 X 2008
118 +( 14+2.5 X 45)
29. (2010?自流井区)计算,能简便的要简便 (73.6 十 0.16+370)X 18
99 - 97+95 - 93+91 - 89+…+7 - 5+3
31. (2012?咸安区)灵活计算
①r (■H)
④爲驾)一错
32. (2012?仙游县)神机妙算:
X QT
34. (2012?遂昌县)用递等式计算.
①[1 -(_! +1) ] X 36
S 3
②(彳+
雳)
X 36
舟"〔(S -3)X 3
〕
2008十200820082009.
(丄+3)x
12=
33. (2012?万州区)怎样算简便就怎样
算.
X14-4 三 13
②2x 5x JL
9 20
⑤丄十62.5%+3 X 卫
11
11 5
③
③7.5 X 4.7+4.7 X 2.5
7 12
36. (2012?平坝县)用递等式计算,能简算的要简
算.
7 14 5 3
35. (2012?绍兴县)递等式计算(能简便的要简
算)
1+2亠 3
6 7 7
38. (2012?瑞安市)脱式计算,能简算的要简
算. 才 5+14
④25.3 X 12 - 33.46 十 0.35
35X( 1
⑤卫X 6 13.54 - 6.88 - 3.12
工
)
i -
io (156X -1- 26)X -A 13 11
2012+558 - 18X 24 3.87+1.44 - 0.87+0.56
37. (2012?陕西)13^ X U +86.6 十星
5 4 5
39. (2012?乐清市)直接写得
数.
卫-丄+0.375=
S 3
9 X( 0.5 -丄)=
3
42. (2012?河池)计算下面各题,怎样简便就怎样计算.
"+星+主
3 3 E 9
40. (2012?金沙县)脱式计算,能简算的要简算
[25
-
44
)X 12]
宁 4
1.25 X 32 X
2.5
12 X ^+1)= 4 6 4.3 X 6.7+0.67 X 67 - 6.7 .
丄十2」= 3 41. (2012?建华区)计算下面各
题.
657+360 - 45X19
9_ 9-几
21 X S X 卫
4 5 21
28.6-( 12.6+18.4)- 1.6
90.5 X 99+90.5= 0.125 X 0.25 X 32=
99 X 101
(M )-11
5 4 6
44. (2012?汉阳区)选择合适的方法计算. 2929 - 29X 34 - 1422
(令岭4)X 24
Z^—JL x 9—
5 17 3
4 5
12.时
_ . _
45. (2012?海港区)脱式计
算
(J4)J + 丄
43. (2012?河
池)
35 X (1-第)
计算下面各题,怎样简便就怎样计算.
.5
12
(156X A-26)
i. J
1.02 -( 5+0.4 X 0.25 )
7 12 7
46. (2012?福州)用递等式计算,能简算的要简算
卫—2 +里—卫-
5
[丄-(』-3)]-丄
2 4 5 10
47. (2012?福州)计算下面各题,能简便的要简
便.
4- 1.25 - 8 3x (_i -d ) 5 12 4 49. (2011?新邵县)下面各题,怎样算简便就怎样算
总+丄 6 12 2 y 〔1-(「如 总X _L +卫X 总 9 13 13 9 48. (2011?沿滩区)计算. 8470 - 104X 65; 50. (2011?厦
门)
1 7
(1) (2丄)
6 15
计算:
5 12
0.6X ( 5.3 - 1.7)- 0.9 ; (2
)
5.2-0.8X 6+42;
[1 -
4峙)]
讦
51. (2011?龙湾区)用递等式计算,能简便的要用简便方法计算.53. (2011?滑县)怎样简便就怎样算
丄+」X 3
4 4
5 —-—0.125
S
9+卫X卫
25 25 9
1^+2 x_L
9 E 9 11
5X(丄—_!)+ -L
3 5 12
48 X U+1-丄)
3 4 2
54.(2011?福州)计算下列各题.(能简算的写出简算
过程)
52. (2011?嘉禾县)用递等式计算下面各题: 10十冷4
(1) 4.27 X 上+4.73 -
8+上, E E
(2) (2.3+2.3+2.3+2.3 )X 2.5 ,
20 25 25 20
55.(2011?福安市)下面各题怎么简便怎么
算.
即(存M;
(15- 14X J!)X JL
7 21
5
78- [32 X( 1 —-) +144];
21 X(討)
工X 4-2X 4;
17 5
15 5
—十(1 - —)X 1
6 20 5
9^X 4.25+4 丄 X 丄
6 4 6
(Q- - 3-)-( 13+11丄)
2 4 5
57.( 2011?毕节地区)计算下面各题,要写出计算的主
要过程
0.32 X 2.5 X 0.125 .
56. (2011?东莞)选择你喜欢的方法进行计
算:
—X 27 -—
58. (2011?巴中)计算下面各题,注意使用简便运算.
(1 )955
4.2.5
(2)536
(3) (15 - 14X 星)X _L
7
21
3
5 S 1
6 2
59. (2011?北海)2•了 X 3斗-和 0.35. J 4
60. (2010 ?重庆)计算下面各题,能简算和要简算.
(里+丄))
5 4 3
6
2
.
(
2
1
2
?
姜
堰
市
)
计
算
下
面
各
题
,
能
简
便
计
算
的
用
简
便
方
法
计
算
23+1 X g 17 23 17
聖X(5+1) E 6 4
(8.5 - 4)X( 0.32- 1.6).
4
.
8
2
-
5
.
2
-
.
8
X
.
6 6.28+5.74+3.72+5.26
61. (2012?康县)计算.(能简算的要简算)
1.9 - 1.9 X(喘79)
[1-#)咗A -(r 討_Z X卫送X —
9 11 9 11
12.3 X
99
57.5 - 14.25 - 1
曲
4
3.
2
X 12.5 X
0.25 .
(2012?丰润区)用最喜欢的方法计63.
算
12.5X 38X 0.8
(8.5 - 4)X( 0.32- 1.6)
67. (2011?满洲里市)
计算下面各题,能简算的要简算.
6.8 - 1.36 - 0.64
9
耳
③〒
X 36+36x
-
6.5X 4.6+6.5X 15.4 64. (2012?东城区)脱式计算. 0.6+32 X 0.25 - 6
丄十[(E +丄)X 4].
3
3 E 13
65. (2012?城厢区)计算下面各题,能简算的要简算 ①96X ( 72- 14.4 )- 3.6
66. (2011?温江区)计
算. 22.7 - 1.8+17.3 - 18.2
(2) (4)
(6) 3899+3737十37
385 X 6- 385 X 6
32X125%X-^
38.4 X 13+30.8 X 26.
(2.5X 73)X 0.4
④[号-(1计)]弋
(8.5 - 4)X( 0.32- 1.6)
0 25+ 11+3+ 4
15 1 15
68. (2011?建华区)计算下面各题. 13.5 -( 6.9+6.1 )- 2.6
70. (2010?云龙县)用递等式计算.
① 3.6 - 2.8+6.4 - 7.2
②7.2X E (7. S+4)2 6 4〕
5
71. (2010?徐闻县)计算下列各题,能简算的要简
算
(1
)(册)
X 36
0.25X( 32+64)- 0.6
(2) 5.28-( 2.56+0.44) +1.72
32.5X 1.7+32.5 X 9.3 - 32.5.
加 1 -
HH )]
.
573+900 - 36X15
®( 6.9 - 3.15) 十 0.3 X
0.8
—丄X
10 2
69. (2011?邗江区)脱式计算. (2.8+4.6 )X( 2.6 - 2.)
72. (2010 ?霞浦县)怎样算简便就怎样
算.
20.3 X 16- 4560- 15
74. (2010?曲周县)选择你喜欢的方法计
算.
3.6 - 2.8+6.4 - 7.2
6.3 X 丄 + 13.7 - 15
15
+上)X 11
9
9 9 14
73. (2010?双阳区) (1) 40.5-0.81 - 16X 2.4
bHxl (2) »[2x( 6 -空
5 5 5 20
25X 12.5X 32
6.72-
1.2
(5 - 4.75)十(2X 2.5 - 3)
18.1 - 5.7 - 4.3+1.9
27 - 7+43X( 1 -卫)
7
3.8X
4.2+38 X 0.58
1.25X 9 - 1.25.
2.5 X 0.125X 32 6.3
—X 17+史 X 23
37 37
75. (2010?萝岗区)计算.(写出解答过程,能应简便方法的要用简便方法)
(1)
76. (2010?龙湾区)用递等式计算,怎样简便就怎样算(1)
375+450 - 18X25
77. (2010 ?龙海市)选择合适的方法,计算下面各题. 920- 40+ 23X 50
12X(丄旦-1)
4 6 3
(3+3 )^-11
3 2 5 18
4.4X」+3.6 十1 丄+0.75
X 2
907+907X 9 - 900
78.
(1) (2010?乐清市) 4.5 X
(0.125X 8- 0.5)X 4
3.7 - 2.2+7.3 - 7.8
(2)
1.25 X
2.5 X
3.2 ;
2.9 X! +1.1 X
丄
(4) 8.1 -( 9 - 6.3 X 1.4 );
才("H)
59+59X 13+14X 41.
18.7 - 4.375 - 6.625
79. (2009?重庆)脱式计算.
30.5 - 40- 8 X 2.4
3.75 X( 1.2 -
丄)
3
81. (2009?淇滨
区)
45.78+45.78 X 99
计算:
8.5+[(当-0.005
7 X 700)十耳
7
3.6 - 2.8+7.4 -
7.2
5 [2 -(r1.5 )-2x 67+33x E. 5
80. (2009?宜昌)用自己喜欢的方法计算. 82. (2009?成都)1 - 2.5+2.5 X
0.4+1 .
205 - 105X 12-45
1.05 X (3.8 - 0.8)-
6.3
83.
① 7.6 - 4.8+8.4 -
5.2
(2008?资中县)用递等式计算(能简算的请简
算)
②4X 0.8X 2.5X
1.25
十50%
③”罟+岭41
④ 1375- 375- 15X 18
884 - 34+17 X 21
⑤ 1.05 X( 3.8 - 0.8)- 6.3
③挣
⑥存叫-詈心普〕
④1盼申C2--|) ]•
84.(2008?武进区)用递等式计算:
① 0.6 - 0.2 X 1.9 - 7.6 ;
86.(2008?邗江区)用递等式计算,能简算的要简
算
(1)18 - 10.4 -(6.2 - 4.9 )
②4 5专-总
X3;
7 E
③1.02十(5+0.4 X
0.25 );
④存(畫)M;
85.(2008?汕头)混合运算.(能简便的要写简便过程)
①4.5 X 8.8 - 2.2 X 4.5 - 4.5
(6)上十[56 X(3 - 上)].
4 ? S
7
② 3%- 15.4+0.125 - 4.6
88. (2008?大足县)脱式计算(其中④、⑤两小题必须
简算).
①730- 240- 15X 16
②[2.06 -( 1.73 - 0.29 ) ] X 1.5
90. (2008?长汀县)用递等式计算(能简算的要用简便
方法计算). ①20-丄-更
18 18
③鳥-[
(畐V
② 9.07 X
99+9.07
④
6.8+2.37+
7.63+4.2 5
17
⑤屯
X 17- 9+3-8X
-
87. (2008?广西)灵活计算下面各题 (1)
54.75 — 5.25 - 14.75 89. (2007?浦东新区)
(1) 13.72 - 1.65 - 2.35
16.4-( 4.3X 2- 0.4)
(2) 2.4+3.6 - 1.2
X 0.2 1.25 X 32
(4) (12.5+1.25 ) X 0.8
5.4
X 7.2+2.8 X 5.4 2 1 1
釣 1 -(計]
(1.2 - 0.4 X 2.5 )
(6) 0.3
X [ ( 13.4 - 10)- 0.5+1.5].
④2.3+3.91 -( 22 - 19.7 )
⑤討岭-(右+ ]-
参考答案:
1.① 428 十[32 +( 4+4)], =428 + [32 十8],
=428+4,
=107;
② 127X 8十127 X 8,
=127+ 127X 8X 8,
=8X 8,
=64
2.(1) 9080 - 35X 26,
=9080- 910,
=8170;
(2)17+ 3.4+1.48 ,
=5+1.48 ,
=6.48 ;
4 7 1 7 1 (3)舟+V-£X(2+2),
9 E 2 S 2
暑仝X H,
9 S E
=冬(卫X n 9 3 S
=4 X11
=44.
号; ) ,
3 4 ,
3 4
4
=9X —十4 ,
3
=12 十4 , =3;
(5)(总+丄)+2+丄,
6 4 3 3
(4)
』X卫」,
12 2 =
2 3
47
24;
(6) 10+[竺-(5+2丄)], 边7 (9 10
3丿」, =10+嚼4)],
=10+谱吗],
=104?,
=81 3. (1) 2004+75X 54- 45,
=2004+4050 - 45,
=2004+90,
=2094;
(2)( 0.125 X 8- 0.5 )X 4,
=(1 - 0.5 )X 4,
=0.5 X 4,
=2;
(3)32%X 76.4+1.36 X
3.2 ,
=32%X 76.4+13.6 X 0.32
=0.32 X( 76.4+13.6 ),
=0.32 X 90,
=28.8 ;
(4)^X」l+3 + 2
7 24 5 5
=JL+丄,
24 4
=11.
可;
:5)(^-2)X(影),
S 16 9 3
2X1!,
16 9
11
16;
(6) 1110十[56 X(卫-d)],
7 E
X卫-56X」],
7 S
-21],
=1110-[56
=1110-[24
=1110-3,
=370
4. (1) (108+ 25)X( 75+ 18), =10搜X75
W Ts ,
=18;
(2) 3.5 X( 20.6 - 16.8 十4.8 ),
=3.5 X( 20.6 - 3.5 ),
=3.5 X 17.1 ,
=59.85 ;
(3)(弓-g)x(舟
2 6
3 5
J X2S
3
56
•
忑;
15
’
),
看X[7 - 4 +(磊冷)],
=3 X 14 =JL X 14
[7 - 4+ q , 5
[7 - 4X , 4 ⑥2 - JL +J
15 9
=2」
5
=JL X 14 / X 14 更 1 5. 9 - [7 - 5], =4
; —, 5
3.14
2, 5.4=3.6 , X 3=9.42 , 780 + 26=30, 27 X 卫=15, 9
⑦36X( 2 +1)
6 3
1
9
=36X 丄 +36X
兰,
6
3
=6+24, =30.
199=426, 0+丄=0, 4 丄—丄-丄 E 弓6'
1 +卫-更 11 S 625 - 9.4
2 10+0.1=10.
1
X
0.1=0.942 ,
0.4 6 .① 92 X 13+28 =1196+28, =1224; ②
4.2 + 1.5 - =2.8 - 0.36 ,
=2.44 ; ③ 78 X 卫 79 0.36 =(79 - 1) 2
=0.16 ,
卫+2-丄.
7 7 f
=79X JL - 79 =3」, 79 ④1+上-上+ 1 4 4 ⑤卫X 5+ 2x 5 5
5 =1 X 5X 5, =25;
7. (1) 3060 + 15 - 25 X 1.04 =204 - 26, =178;
(2) — X 卫 + 里 +■! 3 5 5 E
/ X 总+
丄,
E 4 S
=」+丄,
2 S
丄; 飞;
(3)(三+纟)X(2+ 5)
S3 10
=2 5 X 卫-X 1,
24 10 5 16'
(4)
4 一
3— / 7 9 ‘4 ' 16
[邑丄-丄 4 4 16
』X 点-(丄-討. -主X ,
9 16
=丄
8. (1) 99X 87+87, -(99+1)X 87, =100X 87, =8700;
(2) 18.7 - 3.375 -
6.625 ,
=18.7 -( 3.375+6.625 ), =18.7 - 10, =8.7 ;
(3) 品 X(」+0.5 )+ 县,
15
2
=1
=5? X 头丸, 5 4 4
=6卫十2_1,
4 =3; £+[ (5-卫)十色, 1
5 7 14 4
亠 r —], 15
2 4 (4) -4亠2 = -- •—, 15
3 5' 9.① 630- 18X 24, =35X 24, =840; ② 0.7+3.9+4.3+6.1 , -(0.7+4.3 ) + (6.1+3.9 ), =5+10, =15; ③ 16x 2+4x 2, 5 2 5, =(16+4)X =20X 2, 5 =8; ®( 7.5 - 7.5 X 0.6 )- 4, -(7.5 - 4.5 )- 4, =3十 4, =0.75 ; 0 q 1 ⑤(丄+丄十3)X 丄, 20 10 6 =(2丿 x 3)x 2, 20 10 3 6 -(2+卫)x1, 20 20 6 S ; ⑥寻X [詐4专)], 耳[“二)], 15 L 6(
9
『」, 嗨X 詔], =护吟沖, 10.① 14X 75 - 624十 39 =1050 - 16, =1034;
②5十9+上X 1
7 7
=5 X 1+里X 上
7 9 7' 二 x l ,
7 9
9
1
—
, 9
=1.
一一,
7
③ 2+(5-3)
3 6 4
=2+丄X 邑
3 12 3
= 2+2
——?
3 9
了
④ -L +[2 -(
11 5 也十[2」
11
5 10
丄亠丄 11 ■ 10, 亠
工
E
=卫
IT
11. (1) 1379+450 - 18X40, =1379+25X 40, =1379+1000, =2379;
(2) ( 3.2 - 16+10.8 )- 22,
-(0.2+10.8 )- 22, =11-22, =0.5 ;
(3 )^x 2 丿 X 卫,
11 25 25 11
-(卫+卫)x Z ,
11 11 25
7
=1x _!-,
25 T
(4)丄X JU(卫-3 ),
4 7 6 4
=2 X —丄,
4 712 =14.2
5 X
3 ,
5 =8.55 ;
=1x l x 12, 4 7
=1. X 12x1, 4 '
=3X
(4)48X JL +48X
16
=(_Z_+2+8)
16 16 =9X
48 , =432;
(5)94.47 -
_L+48X 8
16
X 48,
(94.47 -
86.555 )
=3
~7
12. (1) 800 - 608 十32 X 5,
=800 - 19X 5,
=800 - 95,
=705;
(2) 3.68 - 3.6 X
0.2+0.18 ,
=3.68 - 0.72+0.18 ,
=2.96+0.18 ,
=3.14 ;
(3)48 X 9.9+48 X 0.1 , =48X( 9.9+0.1 ),
=48X 10 ,
=480; =94.47 - 94.47+86.555 ,
=0+86.555 , =86.555 ;
(6) 3.42 X 76.3+76.3 X 5.76+9.18 X 23.7 =(3.42+5.76 )X =9.18 X 76.3+9.18
=(76.3+23.7 )X
=100 X 9.18 ,
=918
76.3+9.18 X
23.7 ,
X 23.7 ,
9.18 ,
(4) (1 -上)十0.25 X 4,
4
=0.25 - 0.25 X
4,
=1 X 4,
=4;
(5) (6 - 6X2)+ 12 ,
314. (1) 360+240- 15X 28 , =360+16X 28 , =360+448, =808;
(2)6-2.4 - 0.3 X 1.4 , =2.5 - 0.42 , =2.08 ;
3 4
(3)-X 6+6X-,
77
=(-+ 上)x 6 ,
7 7
4
7,
=(6 - 4)- 12,
=2 - 12,
飞.
13. (1) 97- 1+35.6+0 X 6 =97+35.6+0 , =132.6 ; (2) 1375+450 - 15X 25 =1375+30X25,
=1375 - 750,
=625; =1X 6 , =6;
(4) (2 - 0.4 )
3
丄,
15 3 4
2 3
亠X-,
5 4
_ 3
=10
(3) [4.5+ (13X 213X 上)]
S S
=[4.5+ ( 13X2X 2)]
£
5
=[4.5+9.75] .-z ,
0.5
3 ,
15. (1) 43X 8- 420. 15 ,
=344 - 28,
=316;
(2) - +£■+丄+3卫,
4 1节 4 17,
=(-吕)+ (显+理
4 4 17 17
)
,
=1+6,
=7;
(4) 40十[主 X( 34)],
7 E
=40 -[卫 X 丄],
7 S
© 飞.
16. (1)
型-18X
17,
18
X 17,
324
_595. ^4 ;
(2) 25 X 12.5 X 32, =25X 12.5 X 8X 4, =(25 X 4)X( 12.5 X 8), =100X 100, =10000;
⑶6X
3x 5
=1X -L ,
12
5 — •
=1戈;
=9+6 - 12, =3;
=(3.3+3.7+3 )X 0.75 , =10X 0.75 ,
=7.5 18 .① 405 X( 20 - 172 - 43), =405X16, =6480;
② -L x Z + 丄 x 2,
12 9 12 9
=2 x(卫+丄),
9 12 12
2
=—•
9;
③ 17.31 - 6.15 - 3.85 , =17.31 -( 6.15+3.85 ), =17.31 - 10, =7.31 . ④ 吕rg x *-A )],
10 3 5 10
9 丄9
= --- [——X
10 3 10
=1 • 54 (4)(丄+丄)
2 3
更X 卫-11, 6 3 1S =40十
丄,
2
=80
=25_ 17 13 =4. 1—, 9 (5) =3.9 =3.9 =39; 5 T? 3.9 X 9.77+0.23 X 3.9
X( 9.77+0.23 ), X 10, Z X =Z 3 15
17. (1) (315+285) =600 - 60, =10;
-(315 - 255), (2
) 5-(
r 姑 3
=
5-( 4
吃),
=5- 4--L ,
13
邛.
Is ;
),
(丄乜-A )X 36,
4 6 3
36+丄 X 36--X 36,
6 3
(3)卫X _L + 15,
9 16
=JL X _L ,
18 15
420- 216- 18X 17,
(4) 3.3 X 卫+0.75 X 3.7+75%X 3,
=2X W , 10 3
=3
19. (1) 360 — 225.15X 18, =360 — 15X 18, =360— 270, =90;
(2) d .^X -L ,
5 6 15 US X 邑 25 15’
=3. 5 -- ; - , 5 3 =9 = .
25
21. (1) 360+24- 15X 30, =360+卫 X 30,
5 =360+48, =408; (2) 0.25 X 7.2+2.8 - 0.5 , =1.8+5.
6 , =7.4 ;
=860 — 70 X 7, =860— 490, =370;
(5.9+1.65 ). 2.5 =7.55 . 2.5 , =3.02
(卫+里)X 20.—
4 5 21
=(」X 20+-X 20) 亠里,
4 5
21
22. (1) 109X X+109X X, =(109+109)X X, =218x; (2) 9.5 — =9.5 — 10.4 =9.5 — 0.8 , =8.7 ;
=他. (3) 4.72 — 1.16 — 2.84 ,
=4.72 —( 1.16+2.84 ), =4.72 — 4, =0.72 ; (4) 丄+—邑£ 9 S 4 9
二 X 7 二 X
7
=9;
=1
^, =1丄.
6
(29 -
8),
21, 5+丄—卫) 6 S 12
=空—A )X
6 E 12 (4) 5
7 =-X 24+丄 X 24
—
6 E
=20+21— 10, =41—10, =31 亠1 可,
24,
存24, =(15+16 )X 21, 31
=31 X 21 元, =9 亠 3 +7
20 5 10^
=,
4 10
=21; 3.[ 丈.X 卫], 5^9
£, _29
莎.
23. (1) 3600 — 800.40X 35, =3600 — 20 X 35, =3600— 700, =2900;
(4.6+5.8 -1.3 ,
)十 1.3 ,
= 14X
=9;
(6) =38-[2.5 X 8], =38-20, =1.9
24. (1) 6760- 13+17X 21 , =520+357, =877;
(2) 3.33 X 4.5+4.5 X 6.67
=(3.33+6.67 )X 4.5 , =10X 4.5 , =45; (3) (24)
5 6
丄亠丄
30 - g ,
=6 - 4
7〒‘
=2.
=亍
土 X 13+丄 X 13+4- 17,
10
17
壬+dJ_,
10 17 17
丄+ (兰+4)
10
17 17
上+1,
10
=2卫.
10
=48.
(2) 64 - 15.8 - 14.2 , =64-( 15.8+14.2 ), =64 - 30,
=34; (3)
C56X-|-27) T? =(40 - 27)X =13X JL , 13 =9;
巧 1 7 =g X 36 — -X 36+ 12 6 =15- 6+14, =9+14, =23; X IS
(5)护备 =(18 - 5+1)X 电,
X3G ,
36,
g 14,
25. (1) 53X13+21, =689+21, =710;
(2) 1.65 X 45+55 X 1.65 ,
=1.65 X( 45+55), =1.65 X 100, =165;
(3) —[1 -U +5)], 2 3 9 :丄十[1 -世],
2 9
丄亠丄
2 * 9
2.
26. (1) 25X 12- 850 - 17, =300 - 50,
=250;
(2) =0.25 =0.25 0.25 X 99+25% X( 99+1), X 100, =25;
11
(4)
1小(提)X 律
=-煜呈], =12
^, 27. (1) 2842 - 14+74X 3 =2848- 7 - 2+74X 3,
=203+222, =425;
(2
督(事引 =£ X 12,
38 - [2.5 X( 4.36+3.64 )], )X 13+4- 17,
=102; 3 (3) 3.6 X 99+3.6 =(99+1) =100 X 3.6 3.6 ,
=360; (4)工 4 儿40 t x t ) 5 E =J_」
12 10^
=5
=一.
6
29. (1) (73.6 十 0.16+370 )X 18 ,
=(460+370)X 18, =830X18, =14940; (2) 3.84 十卫+5.16 X 上
4 r = 10. -- , 3 =3.84 X ^+5.16
3
=(3.84+5.16 ) =2X J +丄X 星, 5 7 7" =4 4) 7 7 =1 X 上, 5 =9X ,
3
=12;
(3)「35-县-(0.35+冥),
15
15
=4 ; —, 5 (6) 72 X I - 寻)
=7.35 - 3- 0.35 -A ,
15
15
3 15 15 =(7.35 - 0.35 )-
)
,
=72 X I -72X
寻, =40 - 30, =10 28. (1) ( 384+336)- 15X 13,
=720 - 15X 13, =48X13, =624; (2) (11+30.6 )- 16+16.5 , =41.6 - 16+16.5 , =2.6+16.5 , =19.1 ; (3) 2 -卫X -^- 1 , 4 15 3 =2-S , 3 3 =7-旦
15
=6丄
15
=2.5 X ^X 4),
S
=(2.5 X 4)X 卫,
S
=2-V 4),
=2 - 1, =2;
(4) =[1 - [1 -("H )]十三, 6 4 10
卫]」 12]
10,
30. (1) 3618十45+1620, =80.4+1620 , =1700.4 ;
(2) 67- 67X( 23+19), =67 X( 1 - 23 - 19), =67X( - 41), =-2747;
(3) 200.8 X 73 - 6.3 X 2008 ,
=2008 X 7.3 - 6.3 X 2008 , =(7.3 - 6.3 )X 2008 , =1X 2008 ,
(4) 118 -( 14+2.5 X 45), =118+( 14+112.5 ), =118- 126.5 , 32.
(1)(丄 +1 )X(2-丄),
2 6
3 4
=羽6 •
(5) 99 - 97+95 - 93+91 - 89+…+7 - 5+3 - 1, =2+2+…2+2, =2X 25, =50. =£ X 丄,
3 12 1S
9 X 11 + 卫亠公
- 亍
200E (6) 2008 十 200820082009 -------------- , 200S20082009
31.( 1
)* 倉自, (2)二乂 20 25 25 !!+卫 X A ,
25 25 20
X 20 =g X
20
),
丄—里+2 3 "5 3, =a +2) 3 3 =2 X
20 r , (2) 75
=9 •
一 ,
20
2
5 1
(3)的(弓-半)
3
6 3
电+讣X 3], 3 2
X 3],
4-25X
? =2亠3
3 3 5, -(75 - 25)X 卫, 5 =75X 仝-25X 上 5 ! =
4 •
了 =50X 」,
5
(丄泄)X 12,
3 4
3
12+上 X 12 , 4 =30; (3)(备沽)X14-4乞 13, =5 X 14+4 X 14 ^ —, 14 13 13 =5+ (14- 1)X _!, 13 =5+13X 主, 13 =4+9, =13
33.①520+2613+ 13, =520+201, =721; Q q ②钦5 X 丄,
9
20 2
9
-兰 X —X 5,
9 20 =5+4, =9; X 5,
10
=1 亠 2+1 18 3 6’ =L =可
③4 )^气,
5 4 5 4
-—I --- + —, 12 6
=丄 =1
^14
20 ■ 5 4'
Q ,
4 4 =1;
=1;
④(各上-丄)十丄 3 7 6 42 =(2+卫-丄)X 42, 3 7 6 =5 X 5,
6
=43;
6
=1X 42+里 X 42-丄 X 42, 3
7 6 =28+24 - 7, =52 - 7, =45; ⑤丄十62.5%+JL X 卫, 11 11 E 二X 虽巴X E , 11 5 11 5 5- 3)+1
S 10 2
(逻-X?)X 2,
40 40
⑥丄+ (卫 4 a + 4
=丄+些X
2,
4 40
=吕些 20 20
=(丄+巴 11 11 =1 X 卫,
5 X _S 5, =9
To
34. =[1 ①[1 -(3+1) ] X 36, S 3 -(卫+更 24 35. (1) i +2十卫,
6 7 7
=2+2
,
6 3
=5;
飞; 小 X 36, 鸟X 24 」X 36, 24 =[1 36, =jj ;
2 ;
②(£+_L ) 9 12 2 7 =36X 兰』 X 36, (2)
— X 丄+』十里,
5 4 5 3
=」X 1+2 X 上,
5
二 X
5 犬X 5
=』;
飞;
1
,
(156X ^1-26)X _L ,
13 11
=(48 - 26) =8+21, =29; ③ 7.5 X 4.7+4.7 X 2.5 , =4.7 X( 7.5+2.5 ), =4.7 X 10, =47; ④ 25.3 X 12 - 33.46 十 0.35 , =303.6 - 95.6 , =208; ⑤ _|X [_!十(1 -A|)],
6 3 15
=22x 2
11
X JL
11' =16;
(4) 2012+558十 18X 24, =2012+31X 24, =2012+744, =2756;
(5) 3.87+1.44 - 0.87+0.56 , =(3.67 - 0.87 ) + (1.44+0.56 ), =3- 2,
3
5
⑹
35X( 1
「心卫,
=35X
护务
=20 二5 12
=48 =9+6 - 3,
=15 - 3,
=12
36.
=4 - (1) _^十卫—§x 2,
7 14 5 3
4
—?
5
39
.
§-丄+0.375=2,
S 3 3
X( 0.5 -丄)=1.5 ,
3
=4
(2)13.54 - 6.88 -
3.12 , =13.54 -
( 6.88+3.12 ), =13.54 - 10 ,
=3.54 ;
(3)(丄+1) +丄+星,
S 4 2 5
「2乜,
更畀
4乜;,
7—1=4
——
=—,
9 3 9
12 X(i +2) =5 ,
4 6
U 2丄1
3
9 -邑
17
2 +2
3
90.5
0.125
40.
3 2^
—=8
17
Z十2=2^ ,
3 3
X 99+90.5=9050
X 0.25 X
32=1.
(1) [25 -(3-丄)X 12]十5丄,
2 4 2
37. 13^X 1 丄+86.6 十
丄
5 4=[25 -丄X 12]十5丄,
4 2
=13.4 X 总
+86.6
4
=(13.4+86.6 ) =100 X 1.25 , =125 X舟,
X
1.25 ,
38. (1)丄十5+2 X丄,
9 9 5
=(駅)X g,
9 9 5
=3x丄
9*5 ,
=S .
4 5;
20
=(25 - 3)- d
2 =22亠卫
=4
;
(2)
=JL X Z+
卫
17 9
=1X JL,
17
B
P;
3
•4;i)X 18,
(3)99X 101,
=99X( 100+1),
=99X100+99X 1,
=9900+99,
=9999;
(4) 1.25 X 32 X 2.5 ,
=1.25 X( 4 X 8)X 2.5 ,
=(1.25 X 8)X( 2.5 X 4),
=10X 10,
=100;
(5) 4.3 X 6.7+0.67 X 67 -
6.7 ,
=35X 卫亠 _L ,
7 * 12
12 =20X 竺,
5
=48;
=28.6 - 31 - 1.6 , =28.6 - 19.375 , =9.225 ;
(4)
玉心駅,
=19 亠 19 S 12 24 乜
=2气, =2卫. 9
— -26) 13
S
1?
=22x3,
11
=16;
7
12 7
(3) A 兰斗 13,
S 13 8 =1X 良+1x 1, E 13 E 13
42. (1)
2X 1+i +i
3 3 5’
=7
—
S
44. (1) 2929 - 29X 34 - 1422,
=101 X 34 - 1422, =3434 - 1422, =2012; (2)2+2+2
10 3
5’
=25
=4.3 X 6.7+6.7 X 6.7 - 6.7 , =(4.3+6.7 - 1 )X 6.7 , =10X 6.7 ,
=67 41. (1) 657+360 - 45X 19, =657+8X19, =657+152, =809; =JL ;
IT ,
(3)戛十卫+上十13,
13 7 S
X 上+上X 丄
13 S S
=(些+丄)
13 13
=1 X 丄 S
1
13
7
—,
E
=21 X 』X 5x 4 4 =7
E
=(21 X _L ) 21 X(卫X 总),
4 4
43. (1) 35X
二 5 -?
12
=1X S
1,
=2 5 - 17 3 S
=8x JJ^,
16
=15. P ;
(3) 28.6 - (12.6+18.4 )- 1.6 ,
=(48 - 26)
13 E 13’
=1X E 上+星+星
9 9 5 =2肩,
17
17
_25
1, =!?
(3) ( 1 +丄」 X 24,
=22
;
12 4 3
15
=_L X 24+. 1X 24 - I X 24, (3) J . 12 4 3
=2+6 - 8,
=3十
[56
=8 - 8, 4
=0;
=3亠 — • [2
4 (4)星- 3)
亠11 --- , 4 5 5 4 6 =3亠 — •
3, =4 11 — —■ .11 —5 4
5 20
6 =3 X 1
-21],
10^
仲.谆-
討,
X 上-56X 3], 7 S — —?
4 3
=1 2 1;
4 45.
J +丄 3 10 23. (4)丄十[1 +(」-丄)],
6
5 10
1
3 =--[1
],
6 10
丄10
6
3,
=丄X 卫,
6 10
(2) 9- [1 -(1+^)], 3 [1 W ]
, "9^,
=27; (3) 1.02 -( 5+0.4 X 0.25 ), =1.02 -( 5+0.1 ), =1.02 - 5.1 , =0.2 20^
47. (1) 4- 1.25 - 8, =4-( 1.25 X 8), =4 - 10, =0.4 ;
3
5 3
(2
寻冷,
46. (1) 5— 2+4- 5 6 7 5 7 (邑 2), 7 7 戈+盘- 6 5 竺-1, 30 19 3 0; (2) 2 -卫十总X 二
L , 9 4 16
=2—鱼X —X 2, 9 5 16
=2-2
15,
1;
亍
:3 )5 + 丄十
丄,
6 12 2 V , 6 6
=2; (4
[約1 -i4)]
,
=2 - [1 -丄],
3 L 12」,
2亠!! 3 12,
E •
(5)^x JU 卫 x 2
9 13 13 9
-卫X(JL+JL), 9 13 13
仝X 1,
9
£
■9
48. (1) 8470- 104X 65, -8470-( 100+4)X 65, -8470 - 100X 65 - 4X 65, -8470 - 6500 - 260, -1710; (2)
-0.6
-0.6
-
2.4 ;
(3) 5.2 - 0.8 X 6+42, -39+42, -81;
(3) 4•星-4
5 -5-丄,
5
-4善;
(1-1
2 3 £ •[丄X卫],
S 6 10
-3 • 1 一一•—,
S 20
2
50. (1)令寻心狀
-工x5+卫
30 2 12^
—19, 5
-亦,
-2;
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54
0.6 X( 5.3 - 1.7 )- 0.9 ,
X 3.6 十0.9 ,
x( 3.6 - 0.9 ),
X 4,
=0.6
3
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丄X互X
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3' X
=JL x(丄+6), 25
9 9 =色 X 1, 25 =3+14, =17
=6 ; 25 =5X 5 X(丄-丄) 3 5 2亠5 15 =2 X 12 1 =8 ; 1—
, 5
亠5 •迈 = 1 +
9
4 4
=5 ;
2, (丄+丄-丄), 3 4 2 =48X 上+48X 丄―48X 丄, 3 4 2
=16+12 - 24, =28 - 24, =4 (4) 48 X 5-』- 0.125 , E
( 0.875+0.125 ), =5 - 1, =4;
(3)丄十丄丄+2 X —,
9 5 9 11
=』X 主+2 V 5
9 11
(2)
=5- J IT
52. (1) 10十一+丄 X 4, 9 6 =1X JL ,
11
=5 ; P ;
9 1 =1OX 卫X 4, 5 6 =18+2, 3 (4
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(2) 2乂21+土X _^, 20 25 25 20 2X (更+卫), 20 25 25 54. (1) 4.27 X 丄+4.73 - 8+
丄, S S
—X 1, 20 9 . 帀; =4.27 X-+4.73
E
=(4.27+4.73+1 (3) (15- 14X 2X JL , 7 21 =10X 1,
S
=(15 - 8)X -L , 21
=5
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)X ? (2) (2.3+2.3+2.3+2.3 )X 2.5 , =2.3 S
•
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(4) 21X(1+),
=2.3 =23 4X 2.5 ,
(4X 2.5 ), 10, 55. =21^ yH^X 21,
⑴即(IT
10^
7
11
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=—, 3 =_5_
44
57. (1) (1 丄 X 70) 100
亠2
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7
(2) 78 • [32 X( 1-5) +144] s =78十[32 X 」+144], S =78十[12+144], =78十156, =0.5 , (3)丄x M
15 5 =(丄」 15 15 =",
3 5 x
4 5, =4 . 亦; (4) 0.32 X 2.
5 =0.4 X 0.8 X 2.5 X 0.125 =(0.4 X 2.5 ) =1 X 0.1 , =0.1 X 0.125 , X( 0.8 X 0.125 ), 56. (1) JL x 13 =(27 - 1)X 27-JL 13 g i? 13’ =18; -i )x i
5. ——• 6 10. 看 9戈X 4.25+4 3 X 1
4 S X 1 X 6,
=9^X 4.25+4.25 6 5 1 =()X 4.25 , 6 6 =10X 4.25 , =42.5 ; 13 1
(4)(
6㊁-3 彳)•( 13+11
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=(1-丄)
10
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20 ;
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(2) JL 十[丄X( 2理)
20 2 5 5
=2 • [1 x 6 ],
20
2 5
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20 5
丄x 5,
20 3
=3
4
58. (1) M x 丄十盘,
9 5 5
=星X "
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5 16,
丄 x d x £
5 2 5
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7
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21
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£,
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世,
9 E =—•
9,
(5)主十[(丄+1) 3 5 ], 5
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12
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=4十4 5 15
4Y 15 (3 )J L X [1 -
29
=JL X [1 -J ],
29 S
5 =3; =3 x 5,
29 S
---_ 3 — --- •—, S 16 2 2X 2, 』;(4) 48X
5£
=48x2 +48X 丄-48X_!-,
4
6 12
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86
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S6
=2 1
59. 2.7 乂3丄-』三 0.35=9 - 2丄=芒
勺4 7 7 =86X 邑-邑
S6 S6
=85-坐
S6
4 1 2 60. (1) V +W )+£,
5 4 3
=21X J 20 =84——;
86
(6) — + 23+丄 X JL
17
23 17
=£ X _L + 丄 x 2, 17 23 23 17
,2)芟X(总+』),
5 6 4 5 12' =(JL +JL ) X 丄
17 17
23
=1x1,
23 19 • 飞; (3) 6.28+5.74+3.72+5.26 , =(6.28+3.72 ) + (5.74+5.26 ), =10+11, =21; 23
62. (1) 4.82 - 5.2 - 0.8 X 0.6 , =4.82 =0.92 -6.5 -3.9 X 0.6 , 61-( 1) 1.9 - 1.9 X(缶 2, (2)
=1.9 - 1.9 =1.9 - 0, =1.9 ; X 0,
(■H )]
吒,
]门
(2) [1 -
=
[1 -
卫]
F
10^
7 11
=(丄+1 )x JL 9 9 11 =1X _L , 11
(2)丄.[(24)x 1 ],
3 3 5 13
=1. [ X 丄], 3 15 13
=5 ; 11
(4) =12.3 =12.3 12.3 X 99 , X( 100 - 1), X 100- 12.3 X 1 , =1230 - 12.3 , =1217.7 ; (5) 57.5 - 14.25 - 15总, 4 =1十1 3 15
=5.
65.① 96X( 72- 14.4 )- 3.6 , =96 X 57.6 - 3.6 , =1536;
②(丄 +1+1 )X 12 ,
2 3 4
=57.5 -( 14.25+15 -), 4 =57.5 - 30, =27.5 ; (6) 3.2 X 12.5 X 0.25 , =8X 0.4 X 12.5 X 0.25 , =(8 X 12.5 )X( 0.4 X 0.25 ), =100 X 0.1 , =10 63. (1) 12.5 X 38 X 0.8 , =(12.5 X 0.8 )X 38, =10X 38, =380; (2) ( 8.5 - 4)X( 0.32 十 1.6 ), =4.5 X 0.2 , =0.9 ; =丄 X 12+丄 X 12+丄 X
12 ,
2
3 4
=6+4+3, =13;
③ 2X 36+36X 5 ,
7 7
=(Z + 卫)X 36 ,
7 7
=1X 36 , =36; ④ [5
7
=[号冷] 7 2
丄X 卫,
14 6 _ 5
飞. 6
5,
(3) 6.5 X 4.6+6.5 X 15.4 , =6.5 X( 4.6+15.4 ), =6.5 X 20 , =130; (4) 省十心十(1 -^)], S 4 S 飞七飞], 二 * X 马, S L 4 r
66.
(1) 22.7 - 1.8+17.3 - 18.2 ,
=(22.7+17.3 )-( 1.8+18.2 ), =40 - 20, =20;
(2) 3899+3737. 37,
=3899+101, =4000;
(3) 385X 6. 385X 6 ,
=(385. 385)X( 6X 6), =1X 36 , =36;
(4) 3异天(―-—),
(
)15 蔦 6 3
,
=21 16 64. (1) 0.6+32 X 0.25 - 6, =0.6+8 - 6, =2.6 ;
■1+2 x !, 15 5 6
3 ,
15 15 =1 ;
飞;。