初一数学计算题及答案

初一数学计算题及答案1.25x (8+10) = 1.25x8+1.25x10

= 10+12.5=22.5

9123- (123+8.8)

=9123-123-8.8

=9000-8.8

=8991.2

1.24x8.3+8.3x1.76

二8.3x (1.24+1.76)

=8.3x3=24.9

9999x1001

=9999x (1000+1)

=9999x1000+9999x1

=10008999

14.8x6.3-6.3x6.5 + 8.3x3.7

二(14.8-6.5) x6.3 +8.3x37

二8.3x6.3+8.3x37

8.3x (6.3 + 3.7)

=8.3x10

二83

1.24+0.78+8.76

二(1.24+8.76) +0.78

= 10+0.78

二10.78

933-157-43

=933- (157+43)

=933-200

二733

4821-998

=4821-1000+2

二3823

132x125x25

=4x8x125x25

二(4x25) x (8x125)

=100x1000

=100000

9048-268

二(2600+2600+2600+1248) -26

=2600-26+2600-26+2600-26 + 1248-269 =100+100+100+48

=348

2881- 43

(1290+1591) - 434

=1290-43+1591-43

=30+37

3.2x42.3x3.75-12.5x0.423x16

=3.2x42.3x3.75-1.25x42.3x1.6

=42.3x(3.2x3.75-1.25x1.6)

=42.3x(4x0.8x3.75-1.25x4x0.4) =42.3x(4x0.4x2x3.75-1.25x4x0.4) =42.3 x (4x0.4x7.5-1.2 5x4x0.4) =42.3X[4X0.4X(7.5-1.25)]

=42.3x[4x0.4x6.25]

二42.3X(4X2.5)

=4237

1.8 + 18-1.5-0.5x0.3

= 1.8+12-0.15

= 13.8-0.15

二13.65

6.5x8+3.5x8-47

二52+28-47

二80-47

(80-9.8)x5 分之2-1.32

=70.2X2/5-1.32

=28.08-1.32

二26.76

8x7 分之4-[1-(3.2-2.95)]

=8x4/7-[1-0.25]

=8x4/7-4

二8/7

2700x (506-499) -900

=2700x7-900

二18900900

=21

33.02 - (148.4-90.85) -2.5

=33.02-57.55-2.5

二33.02-23.02

=10

(1-1-1) -5.1

二(1-1) -5.1

=0-5.1

二0

18.1 + (3-0.299-0.23) xl

= 18.1 + 1.7x1

= 18.1 + 1.7

二19.8 [-18J+29+[-52]+60= 19

[-3]+[-2]+[-1]+0+1+2= -3

[-301]+125+301+[-75]= 50

[-1]+[-1/2]+3/4+[-1/4]= -1

[-7/2]+5/6+[- 0.5] +4/5+19/6 = 1.25

[-26.54]+[-6.14]+18.54+6.14= -8

1.125+[-17/5]+[-1/8]+[-0.6]= -3

[-98+76+(-87)]*23[56+(-75)-(7)]-(8+4+3) 5+21*8/2-6-59

68/21-8-11*8+61

-2/9-7/9-56

4.6-(-3/4+1.6-4-3/4)

1/2+3 + 5/6-7/12

[2/3-4-1/4*(-0.4)]/1/3+2

22+(-4)+(-2)+4*3

-2*8-8*1/2+8/1/8

(2/3+1/2)/(-1/12)*(-12)

(・ 28)/(-6+4)+(-1)

2/(-2)+0/7-(-8)*(-2)

(1/4-5/6+1/3+2/3)/1/2

18-6/(-3)*(-2)

(5+3/8*8/30/(-2)-3

(-84)/2*(-3)/(-6)

1/2*(-4/15)/2/3

-3x+2y-5x-7y

1437x27 + 27x563 (75- (12 + 18)] -15

2160- [(83-79) xl8] 280 + 840-24x5

325-13x(266 - 250) 85x(95 - 1440-24)

58870-(105 十20x2) 1437x27 + 27x563

81432-(13x52+ 78) [37.85- (7.85+6.4) ] x30

156x[(17.7-7.2)-3] (947 - 599) +76x64

36x(913-276-23) [192 - (54 + 38) ]x67

[(7.1-5.6) x0.9-1.15]-2.5 81432-(13x52 + 78)

5.4-[2.6x (3.7-2.9) +0.62] (947-599) +76x64 60-(9.5 + 28.9)]-

0.18 2.881-0.43-0.24x3.5 20x[(2.44 - 1.8)-0.4 + 0.15] 28-(3.4 1.25x

2.4) 0.8x (15.5-(

3.21 5.79)) (31.8 3.2x4) *5 194 - 648*1.8x0.9 36.72 -

4.25x9.9 3.416- (0.016x35) 0.8x[(10 -6.76)-12]

(136+64) x (65-345-23) (6.8-6.8x0.55)三8.5

0.12x 4.8-0.12x4.8 (58+37) - (64-9x5)

812-700- (9+31x11) (3.2xl.5+2.5) -1.6

85+14x (14+208-26) 120-36x4-18+35

(284+16) x (512-8208-18) 9.72x1.6-18.305-7

4/7-[1/3x (3/5-3/10) ] (4/5+1/4) -7/3+7/10

12.78-0- ( 13.4 + 156.6 ) 37.812-700- (9+31x11) (136+64) x (65-345-23) 3.2x (1.5+2.5) -1.6