小升初四则混合运算题精选
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3.5 X( 20.6 - 16.8 +
4.8 )
小升初真题混合运算专项练习(有答案)
1. ( 2012?瑶海区)基本计算:
① 428 一 [32 -( 4+4)] ② 127X 8- 127X 8. 2. (2012?武胜县)计算. 9080 - 35 X 26 17 - 3.4+1.48 (;-J X ( )
2 6
3 5
上X [7 -
4+( + :)]. 14 L 15 3 J
计算:
9 - 5.4= 3.14 X 3= 625 - 199=
3. ( 2012?武胜县)计算,能简算的要
① 92X 13+28
② 4.2 + 1.5 - 0.362004+75 X 54+ 45
(0.125 X 8- 0.5 ) X 4 32%X 76.4+1.36X 3.2 ③ 78X :
④ 1 + - - + 1
4 4
⑤ 「: X 5 + 'X 5 5
5
'乂 +'亠
X + . 7 24 5
5
”-二)X(
'+ :)
v S 167 v 9 37
-(■- ')X (
+')
9 S 2 8 2
3+ + 4
3 4
0+ ;=
4 3―丄=
1 + _!= 11 9.4
2 0.4 1
X 0.1 =
10+ [
29
27
6. (2012?桐庐县)计算. 14
5. (2012?万州区)
780 27
+ 26= X-=
10+0.1 =
简算.
⑦36X( ■+ ■)
1110 + [56 X( ■-')] 7.(2012?天柱县)脱式计算.
4.(2012?武胜县)计算. 3060+ 15 - 25 X 1.04
(108 + 25) X( 75+ 18)
2V 9亠4.1
3 5 5 8
3.5 X( 20.6 - 16.8 +
4.8 )
v 7X [ -( J )]. 9 4 16 4
8.( 2012?桃源县)脱式计算.
9. 99X 87+87
18.7 - 3.375 - -6.625
5 -X( +0.5) 一 2 5 4 4
丨+[ ("- 0
15 7 14 亠1
-.
10. ( 2012?苏州)计算下面各题,能
简算的要简算.
11. ①630一 18X 24
② 0.7+3.9+4.3+6.1
③ 16X '+4X •:
5
5
@( 7.5-7.5X 0.6) 一 4
⑤(y 3)X ■,
10. (2012?顺昌县)脱式计算.(能简
算的要简算)
① 14 X 75 - 624 - 39
④,[:-(1-].
11. (2012?泉州)用递等式计算 (1) 1379+450- 18X 40 (2) (3.2 一 16+10.8 ) - 22 (3) 上 X —+二 X 丄 (4) 〕X - +(二-;)
4 7
6 4
12
.
( 2012?硚口区)脱式计算.(友情
提醒:有的可以简算)
13. 800- 608-32X 5 3.68- 3.6X 0.2+0.18 48X 9.9+48X 0.1 (1 - ')- 0.25 X 4
4
(6-6X ) 一 12.
3
14.
( 2012?吉水县)脱式计算, 能简 算
的要简算.
97- 1+35.6+0 X 6
1375+450- 15X 25
[4.5+ (13X ;+13X 「;)] 一
8
8
3
48 X ; +48 X +48X 8
16 16
94.47-( 94.47- 86.555)
3.42X 76.3+76.3X 5.76+9.18X 23.7.
15.( 2012?洪山区)能简便的要用简便方法计算,写出主要过程
16.( 1) 360+240- 15X 28
(2)6- 2.4-0.3X 1.4
(3)X 6+6 X
(4)( ■- 0.4 )一X.
15. (2012?凤阳县)用递等式计算,能
简算的要简算
17.31— 6.15— 3.85 丄十[X
10
(1) 43 X 8 - 420 - 15 (2) +2 +' +3 4
17 4 17
(3) ‘X ,一 15
9
16
(4)
( +)—-「
2 3
5 18 (5)
3.9 X 9.77+0.23 X 3.9
16. (2011?漳州)计算下面各题,怎样
21 .( 2011?武昌区)递等式计算:
360- 225- 15X 18
7X 7
5 6 15
4.72- 1.16- 2.84 + + ;+; 9 8 4 9,
22. ( 2011?田东县)计算下列各题.
23. 860- 560-8X 7
(5.9+1.65) 一 2.5
5 -('一丄+丄)
' 7
14 137
('+' - ')X 36
4 6
3
420- 216- 18X 17 31
25X 12.5X 32
X +
亠:'
6 12 12 5
40 一 [ X( + )]
7
8 2
17.( 2011?游仙区)用自己喜欢的方 法算
+ )X 20 4 5 21 ■- [ ( _+: ) X '].
L L 3
2
(2011?瑞安市) 24. (1) (2) (3) 360+24- 15X 30 0.25 X 7.2+2.8 - 0.5 18.( 315+285)-( 315- 255) (4) X 29 - 8 X : 7
7
(■< — +
'6 8 127 24
].
简便就怎样计算.
25.
(2011?南县)下面各题,能简算 便就怎样计算. 9.5-( 4.6+5.8)- 1.3
20. 405X( 20- 172- 43)
3.3 X +0.75 X 3.7+75%X 3.
4
19.( 2011?永州)下面各题,怎样简的要简算.(能简算的要写出主要简算过程)
26.109X x+109X x
6+ 7 -[:;
下*) X 13+4- 17.
118-( 14+2.5 X45)
23. (2011?金堂县)用自己喜欢的方式
27. (2011?海州区)神机妙算:
计算下面各题(要写出主要的解答过
2842 - 14+74 X 3
24. (2011?淮南)选择合适的方法计算
(11+30.6) 一 16+16.5
(要写出主要的计算过程)
6760 - 13+17X 21 3.33 X 4.5+4.5 X 6.67 2「X 7 -
4 1
5 3
〔1 -(丄報)〕-丄.
6 4
10
29. (2010?自流井区)计算,能简便的
1小(托)帛].
25. (2011?河西区)脱式计算.(能简
(73.6 一 0.16+370 ) X 18
3.84 一 '+5.16 X
4
3
2.5 (弓諾諾諾).
8 S 8 8
1.65 X 45+55 X 1.65
30. (2010?雨花区)计算下列各题,能
>[1 -( + ;)].
简便的要简便计算
程
)
(1) 3600 - 800 - 40 X 35
3.6 X 99+3.6 (2) 64 - 15.8 - 1
4.2 (3) (4) (5)
(56X 巴-27) X A
7 13
(卫-丄丿)X36 12 6 18
18X — - 5X —+A ie 14 14 14
-('X :) 4
5 8
;X + :
亠
5 7 7 4
72 X(二-')
9 12
28. (2011?丰都县)脱式计算 (6) 38- [2.5 X( 4.36+3.64 )].
(384+33⑤一 15X 13
要简便
算的要简算)
53X 13+21
6+ 7 -[:;
下*) X 13+4- 17.
118-( 14+2.5 X45)
26. (2011?河池)用你喜欢的方法计算.
3618-45+1620
25 X 12 - 850 - 17 67 - 67 X( 23+19) 0.25 X 99+25%
200.8 X 73 - 6.3 X 2008
99 - 97+95 - 93+91 - 89+…+7 - 5+3 - 1
2008 一
31.(2012?咸安区)灵活计算
①一
3 5 3
②十m•、:
35
③|_| <工「二
④
32.(2012?仙游县)神机妙算:
+ ')X('-')
26 3 4
X
:+丨,—.H
|| ■- = ■
—〔(二-JX 3〕
3 6 3
(+ ')X 12=
34
33. (2012?万州区)怎样算简便就怎样算.
④二X [ — ( 1 -再)]
6 3 15
⑤二 + ( - —-)^ -
48 10 2
35.(2012?绍兴县)递等式计算(能简便的要简算)
+ ―;
67 7
■X + —
5 4 5 3
(156X 1 - 26)X 7
1311
2012+558— 18X 24 3.87+1.44 -
0.87+0.56
①520+2613一13
②「X 5X '
9 20
@( +)+ +
@( + - ) + 、3 7 6 丿⑤厶62.5%+ X .
1111 5
42
8
(+ )— +
8 4 2 5,
37.(2012?陕西)
38.(2012?瑞安市)
13「: X 1 +86.6 —.
5 4 5
34. (2012?遂昌县)用递等式计算.
亠5+'
995 .:[吉+.1 || L252
①[1 -(;+:)] X
36
(+-)X 18
③7.5 X 4.7+4.7 X 2.5 39. (2012?乐清市)直接写得数.
35 X( 1 -')—'.
712
36.(2012?平坝县)用递等式计算,能简算的要简算.
■—- 'X :
714 5 3
13.54 - 6.88 - 3.12
9 X( 0.5 -)=
3
'j 1 = 9 3
12 X( ■ +)=
4 6
+ 2+ =
3 3
9 -
— =
17 17
2-「— :+ 2=
3 3
工+ :;十 一 —13.
13 7 8
43. (2012?河池)计算下面各题,怎样 简
便就怎样计算.
7 12 7
44. (2012?汉阳区)选择合适的方法计 算.
2929 一 29 X 34 - 1422
0.125 X 0.25 X 32=
的要简算
5
-')X 24 3
+ )—
5 4
6
[25 -( - )X 12] 一 5 2
4
2
:X + “ X : 17 9 17
9 99 X 101
(■+ )+ #
5 4
3 10
-[1 -「)]
1.25 X 32 X
2.5
41. (2012?建华区)计算下面各题.
46. (2012?福州)用递等式计算, 能简
657+360- 45X 19
4.3 X 6.7+0.67 X 67 - 6.7 .
1.02 -(5+0.4 X 0.25 )
90.5 X 99+90.5=
40. (2012?金沙县)脱式计算,能简算 (+ 12 4
4
45. (2012?海港区)脱式计算
算的要简算
21 X -■?
21 X^'.- 28.6-( 12.6+18.4) 一1.6 得
纟+纟―卫=
2-二+,X上二
9 4 16
:*[56 X( ' - ■)]
4- 1.25 - 8
:X( ■—)
5 12 4
6 12 2
—〔1-('-
3 3-】)〕
:'X _ + '' X :'
9 13 13 9
48. (2011?沿滩区)计算.
8470- 104X 65;
0.6X( 5.3- 1.7) 一0.9;
5.2- 0.8X 6+42;
+ ( [- [)X ':;
3 3 5 5,
[-('- ')]「•
2 4 5 10
49.(2011?新邵县)下面各题,怎样算简便就怎样算
8' 16 7
50.(2011?厦门)计算:
(1)( +■+ 7
615 5 12
(2)[1 -( + )]—
(3)X — ' X '.
'丿9 4 15 6
51.(2011?龙湾区)用递等式计算,能简便的要用简便方法计算.
1亠X 5
7 3
■--9+ :8
!■259
5X( ^'- ■)—5
1
48 X (+'- ) 1
' 3 427
52.(2011?嘉禾县)用递等式计算下面各题:
(15- 14X ')X 上
721
21 XC - ■)
24 9
42. (2012?河池)计算下面各题,怎样
简便就怎样计算. 广[1 ]
X + + 3 3 5 9 '-一X 1 -' 47. (2012?福州)计算下面各题,能简便的要简便.
53.(2011?滑县)怎样简便就怎样算
+ ' ; X 3
44
5-「- 0.125
."+:X
9 5 911
['- (- :)] 亠
24510
54.(2011?福州)计算下列各题.(能简算的写出简算过程)
(1) 4.27 X +4.73 - 8+ ,
88?
(2)(2.3+2.3+2.3+2.3 ) X 2.5 ,
55.(2011?福安市)下面各题怎么简便怎么算.
「- J—;
916 4 2,
78一[32 X( 1 - :) +144];
,X:—.乂 s
15 5 15 5,
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 -;
13 13
'—(1 -亠)乂
6' 20丿5
9' X 4.25+4 X
(6 - 3 ')-( 13+11 )
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三一「于三亍」.
58.(2011?巴中)计算下面各题,注意85 X »
86
丄十23+ X_1
17 2317
62.(2012?姜堰市)计算下面各题,能简便计算的用简便方法计算.
4.82 -
5.2 - 0.8 X 0.6
使用简便运算.
X —
(1)I ——
4亠2亠5
(2)三—
(3)(15 - 14 X ')X
721
X + X :
7 9 7 9
-[(+ :)X ]
5L3 511J
I 3
i一__ .
计算下面各题,能简
-X + X '
9 11 9 11
12.3 X 99 57.5 - 14.25 - 15 ;
4
3.2 X 12.5 X 0.25 .
63.(2012?丰润区)用最喜欢的方法计算
12.5X 38X 0.8
(8.5-4)X( 0.32-1.6)
6.5X 4.6+6.5X 15.4
(4)
(5)
7-5
■: I'.
59. (2011?北海) (6)
60. (2010?重庆)
算和要简算.
(+) 一:l::x( ■■+ ;)
5 v
6 47
J.
64. (2012?东城区)脱式计算.
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—一)
■ | - ' ■' - : J「
3 4 12
29
48 X 0.6+32 X 0.25- 6
3 ° ' 3 5丿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
②(「+])X 12
④["-(■- ■) ] i.
7 3 6 5 1 X [1 -(■-■)].
29 4 8
66. (2011?温江区)计算. 70. (2010?云龙县)用递等式计算. (1) 22.7 - 1.8+17.3 - 18.2
①3.6-2.8+6.4- 7.2
(2) 3899+3737一37
②②, ' ' 1. ::i '' : . 1
5
(3) 385 X 6-385 X 6 @( 6.9- 3.15) 一 0.3X 0.8④一 (X)- (4) ;L | - - | 15 5 6 3
1.
(5)二 *「工
④—(*「;)一 1 .
5 6 5 2
(6) 38.4 X 13+30.8 X 26. 71. (2010?徐闻县)计算下列各题,能
67. (2011?满洲里市)
简算的要简算
(1)(—」)X 36 3 6 9
计算下面各题,能简算的要简算.
6.8- 1.36- 0.64 (2) 5.28-( 2.56+0.44) +1.72 (2.5X 73)X 0.4 (3) -
■-二
7 9 7 9 + - +
S 5 S 5
(4) 25X 12.5X 32 0.25+ 】+;+ 1
15 4 15
(5)( 5 -4.75)*( 2X 2.5- 3) 32.5X 1.7+32.5X 9.3- 32.5. (6) 27 - 7+43 X( 1 -:)
68. (2011?建华区)计算下面各题. 72. (2010?霞浦县)怎样算简便就怎样
13.5 -( 6.9+6.1 ) - 2.6 算.
15 X 」—二― 5 2 10
20.3X 16- 4560- 15 573+900 一36X15
2.5X 0.125X 32
6.3 X
一―
69. (2011?邗江区)脱式计算. 73. (2010?双阳区) (2.8+4.6)X( 2.6-2.) (1) 40.5- 0.81- 16X 2.4 0.25X( 32+64) 一 0.6 (2) *[ :X(—丿
(4)18.1- 5.7-4.3+1.9
(5) 3.8X 4.2+38X 0.58
(6) 1.25X 9 - 1.25.
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 +13.7 - 15
15
-(+ JX r
9 ' 9 『14
「X 17< '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)(0.125X 8 - 0.5)X 4
(2)(「)1-;
(3)907+907X 9 - 900
(4)9-[ ^+ (二)]
76.(2010?龙湾区)用递等式计算,怎样简便就怎样算
(1) 3.7 - 2.2+7.3 - 7.8
(2)375+450- 18X25
(3) 2.9 X +1.1 X ,
920- 40 + 23X 50
12 X( ■+ '■-:)
4 6 3
4.4 X ;+3.6 - 1+0.75 X 2
4 3
78.(2010?乐清市)
(1) 4.5 X 9.9+0.1 ;
(2)16-丄+ -二;
14 5 14
(3) 1.25 X 2.5 X 3.2 ;
(4)8.1 -( 9 - 6.3 X 1.4 );
30.5 - 40- 8X 2.4
1.6 X ■+ -
2.4
4 5
一
[2 (")叮」X .
80. (2009?宜昌)用自己喜欢的方法计算.
205- 105X 12-45
1.05X( 3.8- 0.8) 一6.3
884- 34+17 X 21
3.75 X( 1.2 - ) +1
3 4
(4)_(「)
77.(2010?龙海市)选择合适的方法,计算下面各题.
:X 67+33X :.
5 5
82.(2009?成都)1 一2.5+2.5 X 0.4+1 .
83.(2008?资中县)用递等式计算(能
简算的请简算)
①7.6- 4.8+8.4- 5.2
②4X 0.8X 2.5X 1.25
③X _ + 一
9 14 9 13
④1375- 375- 15X 18 简算的要简算
(1)18 - 10.4 +(6.2 - 4.9 )
(3)
[6.85 -( 0.75+0.2 ) ] + 0.5
-+ [56 X(;)]*
87.(2008?广西)灵活计算下面各题
⑤1.05X( 3.8- 0.8)一6.3
⑥「X〔(「- 丨:;〕
5 6 9 5
84.(2008?武进区)用递等式计算:
①0.6 - 0.2 X 1.9 一7.6 ;
②5+ '- 'X '-
77
③1.02 +( 5+0.4 X 0.25 );
④-r+( ■+ :)X「:;
).
的要写简便过程)
①4.5 X 8.8 - 2.2 X 4.5 - 4.5
②38 [- 15.4+0.125 - 4.6
(4) 3.6 + 0.4+1.3 X 5
(5)
(6)
12 2 3
⑤3+ 'X( ■--'
4 v
5 10
(1)54.75- 5.25- 14.75
(2)16.4+( 4.3X 2- 0.4)
(3) 1.25X 32
(4)X [1 -([-])]
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
③「(J】)X
④6.8+2.37+7.63+4.2
⑤「X 17 + 9+3+ 8X「
3 9 89.(2007?浦东新区)
(1)13.72 - 1.65 - 2.35
(2) 2.4+3.6 + 1.2 X 0.2
(3)(12.5+1.25 ) X 0.8
⑤'X [-
(4) 5.4 X 7.2+2.8 X 5.4 (5) 2-( 1.2 - 0.4 X 2.5 ) (6) 0.3 X [ (13.4 - 10)- 0.5+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). ① 20 - " - I
18 13
② 9.07 X 99+9.07
④2.3+3.91 -( 22 - 19.7
)
参考答案:
1 ① 428一[3
2 -( 4+4)], =428 一[32 一8],
=428 - 4,
=107;
②127X8- 127X 8,
=127- 127X8X 8,
=8X 8,
=64
(5)(二+ •)—+,
6 4 3 3
—■:,
12 2 3
=;+
&——?
83
='•
-;
(6)10 —[「-( 一
+ )],
27 9 10 3
=10—L :1-C"+ )],
27 81 3
二”亠『:J -]
2.(1) 9080 - 35X 26,
=9080- 910,
=8170;
(2)17-3.4+1.48 ,
=5+1.48 , =6.48 ;
(3)-( _- ')X( ■+ ),
v 7 9 v8 2 8 2 =—X「,
9 8 8
='X(、厂),
-4
27?
(4)3—1」4, =9X — 4, =12-4,
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 ),
27 81
= 10」
31
3 S =X T — X ,
=3;
=0.32 X 90 , =28.8
(4)'X + —
—+
24 4’
=3;
5. 9- 5.4=3.6 ,
780 一 26=30,
5
=「; ■-;
(5) ( ■- 7)X(
*), 8 16
9 3
=X 厂,
16 9
= H ; =■:
1 3.14 X 3=9.4
2 (6) 1110一 [56 X( ■-:)
],
0+ '=0 , 4 9.42 =1110一 [56 X ■- 56 X ■], 7 8
:—:= ..::■, 0.4 =1110 一 [24 - 21],
1 + 7 =:
11 8 '
1 -
=1110一3,
6.① 92 X 13+28
=370
=1196+28,
4. (1) (108-25)X( 75- 18), =1224;
=1 :s X 25 18?
②4.2 + 1.5 -
0.36
= 18;
=2.8 - 0.36 ,
(2) 3.5 X( 20.6 - 16.8 一
4.8 ),
=2.44 ;
=3.5 X( 20.6 - 3.5 ),
③78X
79
=3.5 X 17.1 ,
—(79 - 1)X 3 79? =59.85 ;
=79X - 1 X 79
3 79?
(3) (:- ::)X( ”),
=3 -
79 =X ::
3 15’
=<■ ■; =25
④ 1 + 一 -一+ 1
(4)
' X [7 - 4-(
+ :) v 7 14 L
' 15 3
], =4 -丄 4?
—:X [7 - 4+ ], 14 ° 5」,
=3「;
[7 - 4X .'],
⑤、5 + 'X 5
5 5 =i H 【7 - 5],
=:「X 5X 5 , 5 5
—X 2 ,
=1 X 5 X 5 ,
625 - 199=426,
27 X =15,
g
10+0.仁 10.1 ,
X 0.1=0.942 ,
2
=0.16 ,
:+=; 7 7 7 ?
=25; =100X 87,
=8700;
(2)18.7 - 3.375 - 6.625 ,
=18.7 -(3.375+6.625 ),
=18.7 - 10,
=8.7 ;
(3)5 X( '+0.5 ) - 2 ,
5 4 4
=5 :X —2 ,
5 4 4
=6 一2 ,
44
=204 - 26, =178;
(2)X —:+
3 5 5 8
=X '+ ,
5 4 8
=:+
28?
=丨:;•
;
(3)( + ')X(
=.! ■ X ■■-X
--m ■,
_ 1 .
16,
(4)X [;-( —-')].
v 79 L4 v1G 47 J =X [ + - ■],
9L4 4 16」'
=X :,
9 16’
=.
_ :.
8.(1) 99X87+87, =(99+1)X 87,
―亠:
= ・ ,
15 3
=:
5
⑥2—丄+
15 9
=2 -
2■,
=-;
■;
⑦36 x( + :)
6 3
=36X +36X •:,
7. (1) 3060- 15- 25X 1.04
16 4
=3
=25; =100X 87,
9.①630- 18X 24,
=35X24, =840;
②0.7+3.9+4.3+6.1 , =(0.7+4.3 ) + (6.1+3.9 ), =5+10, =15;
③16X +4X :,
55 =(16+4)X :,
5 =20X :,
5
=8
;
7.5 - 7.5 X 0.6 ) - 4,
=(7.5 - 4.5 ) - 4, =3- 4,
=0.75 ;
⑤ (〕+卫 + 3)X ,
20 10 6 =(:+ : X ■ )X ■ 20 10 3
6
=(:+ ')X '
20 20 6
-:
20 6? =.. :; ⑥ 二 (丄亠)] ⑥L 「(.丿」, 15
=:X [二+(丄 £ ],
15
6 9 9
J , =「「J , 二::■ I!-,
③ 上 + (£—[) + '
3
6 4 8
=+ X ';, 3 12
3
=:+ :
——>
3 9
;
④ 、「-( 1 - r )].
11 5 10
=「- [ ■-訂
11 [ 5
10],
=「. •
11 ' 10,
=|
11
11. (1) 1379+450- 18X40, =1379+25X40, =1379+1000, =2379
; (2) ( 3.2 一 16+10.8 ) - 22, —(0.2+10.8 ) - 22, =11 一
22,
=
1
=0.5 ; 10 .① 14 X 75 - 624 一 39
=1050 - 16, =1034; ②—9+ X : 7
7 9 =:X + X , 7 9 7 9?
=(~'+ )X :, v 7 T y =X - 7 9’ =■. ■;
(3) X — + r X :, v 7 11 25 25
11
? —(丄 + ; )X ', v ii ir 25,
=1 X —
25’
=「.
.:■;
(4)
〔X v( > '), =X ■--
4
7
12?
—X X 12, 4 7 '
—X 12 X ',
4
7?
=97+35.6+0 ,
=100X 9.18 ,
=132.6 ;
(2) 1375+450- 15X 25 =1375+30X 25, =1375 - 750, =625;
(3) [4.5+ (13X '+13X ')] 一 :
8
8 3
=[4.5+ (13X -X 2) ] 1,
8
3
=[4.5+9.75] i, =14.25 X ;,
5
=8.55 ;
(4) 48 X °+48X +48X 8
16 16
=(^+ ; +8)X 48,
16 16
=9X 48, =432;
(5) 94.47 -( 94.47 - 86.555 ) =94.47 - 94.47+86.555 , =0+86.555 ,
=3X -,
7
=■: •
7
12. (1) 800- 608一32X5, =800 - 19 X 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 , =48 X( 9.9+0.1 ), =48X10, =480;
(4) (1 - ')- 0.25 X 4, =0.25 -0.25 X 4, =1X 4, =4;
(5) (6-6X ― 12, =(76.3+23.7 ) X 9.18 ,
=86.555 ;
(6) 3.42 X 76.3+76.3 X 5.76+9.18 X
23.7 =(3.42+5.76 ) X 76.3+9.18 X 23.7 ,
=9.18 X 76.3+9.18 X 23.7 ,
=97+35.6+0 , =100X 9.18 ,
=918 14. (1) 360+240一15X 28,
=360+16X 28,
=360+448,
=808;
(2)6- 2.4 - 0.3 X 1.4 ,
=2.5 - 0.42 ,
=2.08 ;
(3)X 6+6X ,
7 7?
=('+ )X 6,
7 7='X ,
18 15
=:.
(4)
=■ X ■ —
6 3 1S?
=「—
18 13?
=…
丐;
(5) 3.9 X 9.77+0.23 X 3.9 =3.9 X( 9.77+0.23 ),
=3.9 X 10, =39;
=1X 6,
=6;
(4) (- -0.4 ) 亠 'X '
=1 -X 3
1534?
=:X 3
54?
一3
I"
15. (1) 43 X 8 - 420 ■ 15, =344 - 28,
(Q、
"3
=上+ '■ X £
315 3’
=+ ,
39
=:
9 16. (1) 420-216- 18X 17, 仝+ 18X 17,
18
=百X 17,
324
=M ■.
三;
=316;
(2);+2厂.:+3;, =(:+ ) + (3丄+2丄), 4
4 17
5
3(6):+(:-—
=(25 X 4)X( 12.5 X 8),
17 ? =1+6,
=7;
(3)X—+ 15, '丿9 16 '
(2) 25 X 12.5 X 32, =25X 12.5 X 8X 4,
=100X 100, =10000;
(3) X: +r <:,
=x _1+J!x ,
612 12 6
=(+ ')X 上
6 6 12
=1X ,
12
=
I:;
(4)40r X( ■+ )],
I o W
=4or x ■],
78
=40 -,
2
=80 =405X 16,
=6480;
②x 4 ' x
12 9 12 9’
=:X( —+ '),
9 12 12
=:;
勺;
③17.31 - 6.15 - 3.85 , =17.31 -(6.15+3.85 ), =17.31 - 10,
17.(1) ( 315+285) — ( 315 -255),
=600 - 60, =10;
(2)5-( : =5-( 4「) =5-4-;, ④上+ [ ■ X( '■-:
10 L
35
10
=+ [ X-L],
10「…
-9
=3
=7.31 .
-3
1
19. (1) 360- 225- 15X 18,
1 • =360 -15X 18, (3) ( + - ' )X 36, 4 6
3
=360 -
-270,
=X 36+ X 36 - X 36, 4 6 3
=90;
=9+6- 12, (2) 二'X
5 6 S
=3;
八X
25 8
(4) 3.3 X 40.75 X 3.7+75%X 3, =;:.
=(3.3+3.7+3 ) X 0.75 , (3) 4.72 - 1.16 - =10X 0.75 , =4.72 -(1. 16+2.84 =7.5
=4.72 -4,
18.①405 X( 20 - 172-43),
=0.72
2.84 , ),
=360+ X 30, 5
(4) ■+ : + + ;,
9 8 4 9
=+ +:;,
9 6 9
=+ + , 9 9 6
=1+ , 6 =1 . 6
20. 860— 560一8X 7 =860 — 70 X 7, =860—490, =370;
(5.9+1.65 ) - 2.5
=7.55 一2.5 , =3.02
+ )X 20-'
' 4 5丿 21
=(X20+ X 20) ‘ ', 4
5
21
=(15+16)X , =31
八, =21;
5 L =「; 一 - =•:
=!. 21. (1) 360+24- 15X 30, =408;
(2) 0.25 X 7.2+2.8 - 0.5 , =1.8+5.6 , =7.4 ; (3)
'X 29 — 8X ;, 7
7
=「; X( 29 — 8),
7
=「; X 21,
7 =9;
(4) ( '+ —2)+ — =(— ' )X 24 ,
6 8 12 ,
=■ X 24+「X 24 — : X 24 , 6 8 12 =20+21— 10 ,
=41—10, =31
22. (1) 109X x+109X x , =(109+109)X x , =218x;
(2)
9.5 —(4.6+5.8 ) + 1.3 ,
=9.5 — 10.4 + 1.3 , =9.5 — 0.8 ,
23. (1) 3600- 800一40X 35, =3600 - 20 X 35,
=3600 - 700,
=2900;
(2)64 - 15.8 - 14.2 ,
=64-( 15.8+14.2 ),
=64 - 30,
=34;
(3).[,
( 丄0
=(40 - 27) X :,
13
= 13X :,
13
=9;
(4)」=5=':X 36 - X 36+ X 36,
12 6 18 ?
=15 - 6+14,
=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 ,
=10X4.5 , =45;
6
(4)/.:L ■■■<^1 =12" :X」,
=12—, =48.
=9+14,
=23;
(5)
=(18 - 5+1 )X |;,
=14X 丄
14’
=9;(3) ([+)
3 15
25. (1) 53X 13+21,
=689+21,
=710;
(2) 1.65 X 45+55X 1.65 , =1.65 X( 45+55),
=1.65 X 100,
=165;
(3)上[1 -( '.+ ')],
16+16.5 ,
=ri - 1, 2
9
='
2
26. (1) 25X 12- 850一17,
=250;
(2) 0.25 X 99+25% =0.25 X( 99+1), =0.25 X 100, =25 (3) 6- 7-
=•—.
7 7, =:. ■; (4) -( X ')
4
5 8
=;X 汁,
4
9
亏;
(5)
-X ;+ + - 5 7 7
4
=■ X ■■ + X ,
5
7 7 5 =(+: ) X :,
7 7 5
=1 X ,
5 =•;
=■; (6)
72X( 7-::)
v 7
v 9
127
=72X 二-72X ’ ,
g 12
=肿,
=300- 50,
=100X 3.6 , 27. (1) 2842 - 14+74X 3 =2848-7 - 2+74X 3,
=;X 12, 9 =10
3
(3) 3.6 X 99+3.6
=360; (4) ( 1
「)X 13+4一 17,
=X 13+ : X 13+4- 17, 10
17
'
= *「;+ I 10 17 17?
=40 - 30,
=10
=203+222,
=425;
(2) :+('-:
'丿9 V6 428. (1) (384+336)
=720- 15X 13,
=48X 13,
=624;
(2) (11+30.6 )-
-15X 13,
16+16.5 ,
=2.6+16.5 , =19.1 ;
(3)2- 'X ■-', 4 15 3?
=2-—
::,
=2-( + ■),
3 3
=2- 1, =2;
(4)[1 -( ' + ')]-',
=[1■
=r + r
I J • I"
=-
6
29.(1) ( 73.6 • 0.16+370 ) X 18, =(460+370)X 18,
=830X 18, =14940;
(2) 3.84 • +5.16 X
v 7 4 3
=3.84 X -+5.16 X -,
3 3
=(3.84+5.16 ) X ,
=9X ,
3,
=12;
(3):…;',
15 15
=7.35 - - 0.35 - 1
15=6 ;
15
(4) 2.5 X( ■+ + ■+ )
88 8 8
=2.5 X( X 4),
S
=(2.5 X 4) X :,
8
= 10X ;,
8
=山
30.(1) 3618一45+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, =2008X 7.3 - 6.3 X 2008 ,
=(7.3 - 6.3 ) X 2008,
=1 X 2008 ,
=2008;
(4)118^( 14+2.5 X 45),
15,
(:+ =(7.35 - 0.35 )
=118^( 14+112.5),
=118一126.5 ,
:;
(5)99 - 97+95 - 93+91 - 89+ (7)
=2+2+…2+2,
32 (1)( +)x (「),
_1 ®(匸)「匚 5 4’ 4
=2X 25, =50. (6) 2008一
" ;
200820082009
-: 3
5
31. (1)
=丄-4 +2
3 5 3’ =(+ ■) 3 3
=1 -
=■; ■;
(2) 75「— 25X ;,
3 5?
=75 X 「;— 25 X '
5
5
=(75 — 25) X ', =50X :,
=30;
="X 14+ X 14 — 14
13
=5+ (14— 1)X 13’
4
13’
=5+畑;, =5+4, =9;
(4) I I, _ 1 . 2^1 3 6?
18 =+' 12 6’
3
6’
=
「: X
3
=一 • ':; (2) 12? X 「
20 25 25 9
="X |: +'-X 「 20 ="X
20
="X 20
=「•
20 ; (3)
25 25 20? + ■ ■)
!■ !■ ? 1 , -[(「八 3],
=-[X 3],
3 L 2 」’
=:亠:
—™__ • 3 £, =… 9 ;
(4) (土)X 12, =X 12+ X 12, 3 4
=4+9,
=13
33.①520+2613- 13, =520+201, =721;
②、5 X :
9
=「: X —X
5, 9 20
'
=二 X 5,
10 '
=• 2 ;
=■+-
20 ■ 5 4 =4.7 X( 7.5+2.5 ),
=+ , 4 4 =4.7 X 10,
=1;
=47;
+ - 一)+ _ , 3 7 6 42
④25.3 X 12 - 33.46 - 0.35 , =(■+ - ' )X 42,
3 7 6
=303.6 - 95.6 5
=:X 42+ X 42 - : X 42, 3 7 6
=208;
=28+24 - 7, ⑤二X [ ■ 6 3 一 (1 -]
1!.],
=52 - 7, ='X [—二], 6 3 15
=45;
=:[ J ,
⑤ ' 62.5%+ X :, 11
11 5? =:X 5,
二.'X + X ' 11 5 11 5 =4 ;
=(-+ 1 )X 1 11 11 5
⑥+(;
-)
10 亠.
-:,
=1X :, 5
=一+ r''- 4 40 -V) X 2 , =:;
5
=+「X 2,
4 40
34.①[1 -(;+:)] X 36,
=「+
丨:;
=[1 -(「+ " ) ] X 36, L 24 24 」 =;
io .
=[1 - ''[ X 36, L
24」
,
35. (1)
+ 1 6 7
_ 3 =亠 X 36,
24 ' =+ :
6 3’
=卩;
:;
=■. ■;
②(+「)X 36, v 9 12 ,
(2)
'X 5
1丄3 . _ 4
3? =36X :「:,
―X ■ +':: 5 4 5 浮
=8+21, =:X ( ■ + 5 ' 4
=29;
=:X 1,
③7.5 X 4.7+4.7 X 2.5 ,
=:.
.;
9
(3) (156X - 26)X 7 ,
13
11
=(48 - 26)X :, =22 X 上 11
=16; (4) 2012+558一 18X 24,
=「一 丨:
^2乜,
=」 古,
=2 20
37. 13 X 1 +86.6 一
5 4 =13.4 X +86.
6 4
5
X ■
X :,
=2012+31X 24, =(13.4+86.6 ) X 1.25 ,
=2012+744, =100X 1.25 ,
=2756;
=125 (5) 3.87+1.44 - 0.87+0.56 ,
=(3.67 - 0.87 ) + (1.44+0.56 ), =3- 2, =1
; 38. (1) + 5+ .', 9
9 5 =r.:)X ■,
9 9 5’
=: 9X 5 ,
-8
. 5 12?
(6) 35X( 1 -.;) 一 ,
=35 X 十
7
=20 :匚, 12’ 12
?
=48 36. (1) ■ -X :,
7 14 5 3
=4-
.,
45, (2)「一;,, 备中却, =•.匚:
=「;. 一一;
(3) ( + - JX 18 ,
2 2 6
=X 18+ X 18- X 18 , 2 3 6
=3,
;
=9+6- 3, (2) 13.54 - 6.88 - 3.12 , =15-3, =13.54 -( 6.88+3.12 ), =12 =13.54 - 10, 39.
=3.54 ;
(3)(:…+ ',
:-;+°.375=
X( 0.5 - ') =1.5 ,
1_4
;=|’
1422,
=16; (3) ;; ;;「;,
12 X( +) =5,
4 6 + 2+ =, 3 3 2 9 —
_ 丄=8 17 2 一 —
3 90.5
17 丄 2=2 ,
3
3
99+90.5=9050
0.125 X 0.25 X 32=1.
(1) [25 —(■— )X 12] 一 5 ,
2 4
2
=[25 — X 12] 一 5 ,
4
2
=(25 — 3) - 5 2
40. =10X 10 , =100;
(5) 4.3 X 6.7+0.67 X 67 — 6.7 ,
=4.3 X 6.7+6.7 X 6.7 — 6.7 , =(4.3+6.7 — 1) X 6.7 , =10X6.7 , =67 41. (1) 657+360- 45X19, =657+8X19, =22 二 =4; (2)
: X '+—
X :,
17 9 17 9?
='X + X ', 17 9 17
9
=(+ ) X ', 9 9 17 = 1X _i
1厂
-8 .
=657+152,
=809;
(2) 21 X
「二
=21 X X 、X — 4 4 21
=(21 X )X( X '),
21
4 4
=8X ",
16’
17? (3) 99X 101,
(3) 28.6 —(12.6+18.4 ) - 1.6 , =99X( 100+1), =28.6 — 31 - 1.6 , =99X 100+99X 1, =9900+99, =9999;
=28.6 — 19.375 , (4) 1.25 X 32 X 2.5 ,
=1.25 X( 4X 8)X 2.5 , =(1.25 X 8)X( 2.5 X 4),
=9.225 ;
(4) (—)+「'
()■ -I J , 亠 19.8 F •
=2+ :, =2;.
42. (1) 'X ■+ + ,
3 3 5 9
^ + + - 9 5 9
」+ +
9 9 5
=2+ ,
5 =2 ‘;
(2)
=— 17 = I' ='—
I'
_ 8 . J x -:-
17 3 8 8?
:—■ ::, (:+ ), 8 8
1, =、丨:匸x ,
8 13 8
13
=、(» ),
8 13 13
=X 1 , 8
=_
8
44. (1) 2929-29X 34 =101X 34 - 1422, =3434 - 1422, =2012;
17
? ⑵「:, (―),
以+ ::+13, 13 7 8
'
」x ■< X
13 8 3 L
=(+
) X
13 13
:, (3)
13'
:
,
10
=■ . .■:
=2 ;
(3) (—+ - ')X 24, v 7 v 12 4 37 ' =1 x =「x 24+ X 24 - ' X 24, 12 4 3
43. (1)
=2+6- 8, =8 - 8, =35—:, =20 X 亠 =0
; (4):-(匸)
=48; (2)
=二 _1 一
—I — — .
5 20
6 ? 4
3
=(48 - 26 )X :, =22 X ?,
5 =
:
=■:
10?
45. (1) ( :+ )一 丁 3 10?
1422,
=16;
(3) ;; ;;「;,
=「:;•
||;
(2) 9- [1 -()],
2 6
=9 - [1 - ■], =9—
9 ;,
47. (1) 4 - 1.25 - 8,
=0.2 46. (1) 7 - ■+ -,
6 7 5
7?
-(+ :)
(7 7),
1,
2- —'X 丄
9 4 16’ =2 - 'X 〔X 上
9
5 16?
=2 - \
15
-28.
15,
(3) :-[56 X(-')],
=—[56 X - 56 X ;], 4
L 7
S J ?
=-[24 - 21],
=—3,
4 ,
=;X — X , 4 3’ ='. -;
(4)
- [1 -(:- “丿],
(2)
X (上一;), 5
12 4 ?
=,X -, 5 9’ =:. 3 ; (3) 一'+ ' - ■,
6 12 2’
=+ ,
6 6 =2; (4)
:-[1 -(■-.■)],
(3) 1.02 -( 5+0.4 X 0.25 ),
=4-( 1.25 X 8), =1.02 -(5+0.1 ),
=4 -10, =1.02 一 5.1 ,
=0.4 ; =-[1 -訂, 6 10
=:亠⑴ =X ,
6 10
=27;
=■+ 6 5
30
=1' '• 30?
(2)
='X 1, g , =■ ~9
48. (1) 8470 - 104X 65, =8470-( 100+4)X 65,
[1 -
] 3
12J
,11 3 12,
. ;
:
(5)
X g
■ + -X (r + ?
g 、13
5 『;,
),
=1;
51. (1) > X 5,
=8470— 100X 65- 4X 65, =8470 — 6500 - 260, =1710;
0.6 X( 5.3 — 1.7 ) - 0.9 ,
=0.6 X 3.6 一 0.9 , (2)二X 二-:+ ',
9 6 9 5
=二 X " — X',
9 6 9 6 =(—')X ',
9 9 6
=X ',
9 6 -5 . =0.6 X( 3.6 一 0.9 ), =0.6 =2.4
(3) 5.2 - 0.8 X 6+42,
54, (3) 4 一 — 一 4, 5 5 =5 ―
5 .,
=4 ; € ; (4) - [ (' — ')X ], 8 L 2 3 10」'
=39+42, =81;
=;亠[ 飞• [ | _3亠1 8 - :X - 6 10
:
.,
(4)
】+(二—
:)X '
3
3 5 r
…1 X - 3 15 5 ='X r
'X ■ 3
4 5 =
:;
(5) [丨
=[—]
L 2 20」
='X"
— X -- 20 〔 =■ 2 49. =2 — =2 —
=2 — (「)]-
7 10
?
2-』」—丄 8 16 7?
■■—: 7卞 v 7 77 ? (1) 1, 10’
3 20’
=■ ■
~2
50. (1) C + ' )- :+仝
6 15
5 12
—X +
30 2 12' =「匚 =' .:, =2; (2) [1 —( + ) ] + ;
' 'L v 4 8
4
—[1 — ;] X ,
L 8J 3?
='X -
8 3’ ■■; (3) =.■: 3 = F .
'X :-二X 「 9 4 15 6
7
10?
10,
10,
=丁5, =丨!;
TT
(2) ' - 9+ ; X 25 25 9?
='X ' + : X :,
"9 25 9 (+ )
(9 9),
1,
5X(丄一丄)* 、35丿 =5X -,
15 12 =:X .
一;,
=:;. -.
(4) 48X( + -)
3 4 2
=48 X 丄+48 X ' - 48X ',
3 4 2 =16+12 - 24,
(3) (15 - 14X-)X 7
7
21
=(15 - 8)X 7 ,
21
=7X 上
21 =';
(4) 21 XC . ■), =21X :二 X 21,
7 3
=3+14, =17 53. (1) ■+ X 3,
4 4
=+ ^ 4 4’
=二. 乜;
(2) 5 - - 0.125 , =5-( 0.875+0.125 ),
=5 - 1 ,
=28 - 24,
=4
52. (1) 10- X4,
9 6
?
=10X '+' X 4,
5 6 =18+ ,
3,
=18;
;
(2) 20 ="X 20 =.
25 ='X 25 ='X 25
=■-. =4; 20?
7+ -X : 20 25 25 ' 25 25 ),
11,
(「)] 7
10?
10, 10,
■I;
(3)
二+—+ : X 一,
g 5 9 11 ?
=_ X " + X : 9 11 9 =(+ :)X 、9 y =1 X ,
11?
=「. :; (4) [ ■:- =[丄—3 ]亠 [:/1]
= 亠, ~20
=:。