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

3.2X6+

(L5+25)

小

1.6

(3.2XL5+25)

小

1.6

500X

(3.87—0.13)

+42X3.74

3302 —

(148.4 —

90.85)小

1)23+(173)

(2) (—84)+(—49)

(3) 7+(—204)

(4}4.23+(—7.57)

(5) 〒7、3)+(—7、

(6) 9、4+(—3、

(7) 3.75+(225)+5、

(8) —3.75+(+5、

4)+(—L5)

(9) (—17、4)+(—10、

3)+(+13、3)+(11、

(10)

(—1.8)++0.2)+(—1.7)+p l )+(+1.8)+(+1.4

)

(11) (+1.3)丄+17

、

85+14X (14+208小

26)

(58+37) <

(64—9X5)

(6.8—6.8

X P 55T 85

(284+16)

(512—8208

小一

0.12X

小

0.12X4.8

(3.2X1.5+2.5)

小一

120—36x4418+35

10.15

—

10.75X0.4—5.7

0O X

(3.87—P13)

+4.2X3.74

347+45x2—4160

小

3252

—

(6+9.728

小

3-2)

X2.5

(58+37) <

(64—9X5) 〔

(7.1—5.6)

X0.9—1.15

〕小

2.5

(3.2X1.5+25)

41.6

5.4 上

2.6X

(3.7—29)

+P 6

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12x6

小

(12—7.2)

—6

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1、9

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9 X 5、

6 +

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8、9 — 1、3

0」2x

+ 1OO X 0.9H 7.2 (9 I 5x )

x o .3n l o 2 6.4X —XH28+44 IL 7 X

5、

49 +

3、

12 6

X ( 1、

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2、

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13?

X 4、

5 + 8 X

11、

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X 5、6|5、6 15?

9、

7 ? (

2、7|10、

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? 5、9 x 一8 114 X

2、

(12)

(—2)丄

+2、3)

(13)

卞 7.2)V 6.3)+

(L 1)一

(14) _(—5、4)丄—3、4)-丄 1—

、

丄—3、4_)

(15) (—2、199)v7、

6—3、

2+8、3)

(16}4a)v3b)*(5c)*l 、6

3、

7 X 49、9

—

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8、9

15、36 +

1、

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2、

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8 X 5、4 +

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6-I-3、8|3、8-I-6

4、7 X

5、

3、

5、

17.4/5 x 25/16 + 2/3 x 3/4

18.14 x 8/7 一5/6 x 12/15

19.17/32 - 3/4 x 9/24

20.3 x 2/9 + 1/3

21.5/7 x 3/25 + 3/7

22.3/14 xx 2/3 + 1/6

23.1/5 x 2/3 + 5/6

24.9/22 + 1/11 - 1/2

25.5/3 x 11/5 + 4/3

26.45 x 2/3 + 1/3 x 15

27.7/19 + 12/19 x 5/6

28.1/4 + 3/4 - 2/3

29.8/7 x 21/16 + 1/2

30.101 x 1/5 - 1/5 x 21

31.50 + 160-40 (58+370) - (64-45)

32.120-144-18+35

33.347+45x2-4160-52

34 (58+37) - (64-9x5)

35.95三(64-45)

36.178-145-5x6+42 420+580-64x21-28

37.812-700- (9+31x11) (136+64) x (65-345-23)

38.85+14x (14+208-26)

39. (284+16) x (512-8208-18)

40.120-36x4-18+35

41.(58+37) - (64-9x5)

42.(6.8?6.8x0.55)三8.5

43.0.12x 4.8-0.12x4.8

44. (3.2xl.5+2.5) -1.6 (2) 3.2x (1.5+2.5) -1.6

45.6-1.6-4= 5.38+7.85-5.37=

46.7.2-0.8-1.2x5= 6-1.19x3-0.43=

47.6.5x (48-1.2x4) = 0.68x1.9+0.32x1.9

48.10.15-10.75x0.4-5.7

49.5.8x (3.87-0.13) +4.2x3.74

50.32.52- (6+9.728-3.2) x2.5

51.-5+58+13+90+78-(-56)+50

52.-7*2-57/(3

53.(-7)*2/(1/3)+79/(3+6/4)

54.123+456+789+98/(-4)

55.369/33-(-54-31/15.5)

56.39+{3x[42/2x(3x8)]}

57.9x8x7/5x(4+6)

58.11x22/(4+12/2)

59.94+(-60)/10

a A3-2

b A3+ab(2a-b)

=a A3+2a A2b-2b A3-ab A2

=a A2(a+2b)-b A2(2b+a)

=(a+2b)(a A2-b A2)

=(a+2b)(a+b)(a-b)

(x A2+y A2)A2-4y(x A2+y A2)+4y A2

=(x A2+y A2-2y)A2

(x A2+2x)A2+3(x A2+2x)+x A2+2x+3

=(x A2+2x)A2+4(x A2+2x)+3

=(x A2+2x+3)(x A2+2x+l)

=(xA2+2x+3)(x+l)A2

(a + l)(a+2)+(2a + l)(a-2)-12

=a A2+3a+2+2a A2-3a-2-12

=3a A2-12

=3(a+2)(a-2)

x A2(y+z)A2-2xy(x-z)(y+z)+y A2(x-z)A2 = [x(y+z)-y(x-z)]A2

(xz+yz)A2

(o +e )(？q + p )Z

H &+q — p +o +q + e )?q + p )z : &+q — e )(o —q + e )+(o —q + p )(o +q + p )H Zv(o —

q)0e+g0(q+ell CXJ v o —z v e +z

(zt+e)(寸

+B O0TI o -c +CN +

e )=CXJ —(0 + e )oo H

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寸二+寸

J5X 8

?寸

co x 6

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CXJ l 9

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9E V 2X

6、

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X 27O0

Q (■

c+x+zvx)(〒

x)(z+xll

a+x+CMVXKZ —x+zvxn

z —(

x +CM v x )—z <

+z v x n CXJ —

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/ 十1.8x0.9二7.2 (9 一5x”0.3二1.02 6?似-X二28+44

11.7 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 一5/6

15.9/7 - ( 2/7 - 10/21 )

16.5/9 x 18-14 x 2/7

17.4/5 x 25/16 + 2/3 x 3/4

18.14 x 8/7 一5/6 x 12/15

19.17/32 - 3/4 x 9/24

20.3 x 2/9 + 1/3

21.5/7 x 3/25 十3/7

22.3/14 xx 2/3 + 1/6

23.1/5 x 2/3 + 5/6

24.9/22 + 1/11 - 1/2

25.5/3 x 11/5 + 4/3

26.45 x 2/3 + 1/3 x 15

38.85+14X

(14+208小26)

39?

(284+16)

(512—8208

小

18)

4P120—36X4小

18+35 4L

(58+37)小(64—9X5)

42.(6.8—6.8XO .55T 8.5 43.0.12X

4840.12X4.8

44 (3.2XL5+2.5)

41.6

(2)

3.2X

(1.5+2.5)

45.6

—

1.644“

5.38+7.85—5.37H 4

7.240.8—L2X5H

6—L19X3—0.43H

4765X

(48 —

1.2X4)

H 0.68X L 9+0.32X 1.9

481O15—10.75X0.4—5.7

27. 7、

19 + 12、

19 X

5、

28 1、

4 +

3、

4 小

2、

29?

8、

7 X 21、

16 +

1、

2 3P

101

1、

5|1、5

3L50

+ 160小

40 (58+370) <

(64—45)

32120 —

144

小 18+35

33.347+45x2—4160452

(58+37)小

(64—9X5) 35.95小

(64—45) 36.178 —

145小

5X6+42

420+580—64x21428

37.812—700小(9+31x11)

(136+64)

(65—345423)

49.5.8x (3.87-0.13) +4.2x3.74

50.32.52- (6+9.728-3.2) x2.5

51.-5+58+13+90+78-(-56)+50

52.-7*2-57/(3

53.(-7)*2/(1/3)+79/(3+6/4)

54.123+456+789+98/(-4)

55.369/33-(-54-31/15.5)

56.39+{3x[42/2x(3x8)]}

57.9x8x7/5x(4+6)

58.11x22/(4+12/2)

59.94+(-60)/10

a A3-2

b A3+ab(2a-b)

=a A3+2a A2b-2b A3-ab A2 =a A2(a+2b)-b A2(2b+a)

=(a+2b)(a A2-b A2)

=(a+2b)(a+b)(a-b)

(x A2+y A2)A2-4y(x A2+y A2)+4y A2

=(x A2+y A2-2y)A2 3.

(x A2+2x)A2+3(x A2+2x)+x A2+2x+3 =(x A2+2x)A2+4(x A2+2x)+3

=(x A2+2x+3)(x A2+2x+l)

(a+l)(a+2)+(2a+l)(a-2)-12

=a A2+3a+2+2a A2-3a-2-12

二3a八2-12

=3(a+2)(a-2)

x A2(y+z)A2-2xy(x-z)(y+z)+y A2(x-z)A2 = [x(y+z)-y(x-z)]A2

=(xz+yz)A2

=z A2(x+y)A2

3(a+2)A2+28(a+2)-20

= [3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

(a + b)A2-(b-c)A2+a A2-c A2

=(a+b)A2-c A2+a A2-(b-c)A2

=(a + b+c)(a + b-c)+(a + b-c)(a-b+c) (a + b-c)(a + b+c+a-b+c)

2(a+b-c)(a+c) 8.

x(x+l)(x A2+x-l)-2