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初一100道数学计算题及答案

1.25 X( 8+10)

=1.25X 8+1.25X

10

=10+12.5=22.5

9123- (123+8.8)

=9123-123-8.8

=9000-8.8

=8991.2

1.24 X 8.3+8.3 X 1.76

=8.3X( 1.24+1.76)

=8.3X

3=24.9

9999X1001

=9999X( 1000+1 )

=9999X 1000+9999

X 1

=10008999

14.8 X 6.3-6.3 X 6.5+ 8.3 X 3.7

=(14.8-6.5)X 6.3 + 8.3X 3.7

=8.3X 6.3+8.3 X 3.7

8.3 X( 6.3+ 3.7)

=8.3X 10

=83

1.24+0.78+8.76

=(1.24+8.76) +0.78

=10+0.78

=10.78

933-157-43

=933- (157+43)

=933-200

=733

4821-998

=4821-1000+2

=3823

I32 X 125 X

25

=4X 8X 125 X 25

=(4X 25)X( 8X 125)

=100X1000

=100000

9048 - 268

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

=30+37

3.2 X 42.3 X 3.75-12.5 X 0.423 X 16

=3.2X 42.3 X 3.75-1.25X 42.3 X 1.6

=42.3 X (3.2 X 3.75-1.25 X 1.6)

=42.3 X (4 X 0.8 X 3.75-1.25 X 4 X 0.4)

=42.3X (4 X 0.4 X 2X 3.75-1.25 X 4X 0.4)

=42.3 X (4x0.4x7.5-1.25x4x0.4)

=42.3

X [4 X 0.4 X

(7.5-1.25)]

=42.3 X [4 X

0.4 X

6.25]

=42.3 X (4 X 2.5)

=4237

1.8+18- 1.5-0.5 X 0.3

=1.8+12-0.15

=13.8-0.15

=13.65

6.5 X 8+3.5X 8-47 =52+28-47

=80-47

(80-9.8) X 5 分之 2-1.32

=70.2X2/5-1.32

=28.08-1.32

=26.76

8 X 7 分之 4 - [1- (3.2-2.95)]

=8X 4/7 - [1

1 - 0.25]

=8X 4/7 - 4

=8/7

2700X( 506 — 499)-

900

=2700 X 7 -900

=18900 - 900

=21

33.02 —( 148.4 — 90.85)- 2.5

=33.02- 57.55 - 2.5

=33.02— 23.02

=10

(1 - 1 — 1)- 5.1

=(1 — 1)- 5.1

=0- 5.1

=0

18.1 +( 3— 0.299 - 0.23)X 1

=18.1 + 1.7 X 1

=18.1 + 1.7

=19.8

[-18]+29+[-52]+60= 19[-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

卜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

1437 X 27+ 27 X 563 〔 75- ( 12+18)〕- 15

2160 -〔( 83-79 )X 18〕280 + 840 - 24 X 5

325- 13X (266 — 250) 85 X (95 — 1440- 24)

58870 - (105 + 20 X 2) 1437 X 27 + 27 X 563

81432 -(13 X 52 + 78) [37.85- ( 7.85+6.4) ] X 30

156 X [(17.7-7.2) -

3] (947 — 599)+ 76 X 64

36X (913 — 276-23) [192 —( 54 + 38) ]X 67

[(7.1-5.6 )X 0.9-1.15] - 2.5 81432 - (13 X 52 + 78)

5.4 - [2.6 X( 3.7-2.9) +0.62] ( 947 — 599)+ 76 X 64 60 — (9.5 + 28.9)] - 0.18 2.881

- 0.43 —

0.24 X 3.5 20 X [(2.44 — 1.8) - 0.4 + 0.15] 28-(3.4 1.25 X 2.4) 0.8 X〔 15.5-(3.21 5.79)〕 (31.8 3.2

X 4) - 5 194— 64.8- 1.8X 0.9 36.72 - 4.25

X 9.9 3.416- ( 0.016X 35) 0.8 X [(10 — 6.76)- 1.2]

(136+64 )X( 65-345 - 23) (6.8-6.8X 0.55) - 8.5

0.12 X 4.8 - 0.12 X 4.8 ( 58+37) -( 64-9 X 5)

812-700-( 9+31 X 11) (3.2X 1.5+2.5)- 1.6

85+14X( 14+208 - 26) 120-36 X 4 - 18+35

(284+16)X( 512-8208 - 18) 9.72X 1.6-18.305 - 7

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

12.78 — 0 -( 13.4 + 156.6 ) 37.812-700 -(9+31 X 11)

(136+64 )X( 65-345 - 23) 3.2

X( 1.5+2.5)- 1.6

85+14X( 14+208 - 26) ( 58+37) -( 64-9 X 5)

(6.8-6.8 X 0.55) - 8.5 (284+16)X( 512-8208 - 18)18. 14 X 8/7 5/6 X 12/15

0.12 X 4.8- 0.12 X 4.8 ( 3.2 X 1.5+2.5)* 1.6

120-36 X 4- 18+35 10.15-10.75 X

0.4-5.7

5.8 X( 3.87-0.13) +4.2X 3.74 347+45 X 2-4160 - 52

32.52- (6+9.728 - 3.2 )X 2.5 87 ( 58+37)-( 64-9 X 5)

[(7.1-5.6 )X 0.9-1.15] - 2.5 (3.2 X 1.5+2.5)- 1.6

5.4-[2.6 X( 3.7-2.9) +0.62] 12 X 6-( 12-7.2) -6

3.2 X 6+ (1.5+2.5) - 1.6 ( 3.2 X 1.5+2.5)- 1.6

5.8 X( 3.87-0.13) +4.2X 3.74

33.02 —( 148.4 — 90.85)- 2.5

1)23+(-73)

(2) (-84)+(-49)

(3) 7+(-2.04)

(4) 4.23+(-7.57)

(5) (-7/3)+(-7/6)

(6) 9/4+(-3/2)

(7) 3.75+(2.25)+5/4

(8) -3.75+(+5/4)+(-1.5)

(9) (-17/4)+(-10/3)+(+13/3)+(11/3)

(10) (-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)

(11) (+1.3)-(+17/7)

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

(13) |(-7.2)-(-6.3)+(1.1)|

(14) |(-5/4)-(-3/4)卜|1-5/4-卜3/4|)

(15) (-2/199)*(-7/6-3/2+8/3)

(16) 4a)*(-3b)*(5c)*1/6

I. 3/7 X 49/9 - 4/3

2. 8/9 X 15/36 + 1/27

3. 12 X 5/6 - 2/9 X 3

4. 8X 5/4 + 1/4

5. 6- 3/8 — 3/8 - 6

6. 4/7 X 5/9 + 3/7 X 5/9

7. 5/2 - ( 3/2 + 4/5 )

8. 7/8 + ( 1/8 + 1/9 )

9. 9 X 5/6 + 5/6

10. 3/4 X 8/9 - 1/3

0.12 x + 1.8X 0.9=7.2 (9 — 5x )X 0.3=1.02 6.4 x - x =28+4.4

II. 7 X 5/49 + 3/14

12. 6 X( 1/2 + 2/3 )

13. 8 X 4/5 + 8 X 11/5

14. 31 X 5/6 - 5/6

15. 9/7 - ( 2/7 — 10/21 )

16. 5/9 X 18 - 14 X 2/7

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