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初一数学计算题及答案.doc

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1、初一数学计算题及答案1.25(8+10) =1.258+1.2510=10+12.5=22.5 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2 1.248.3+8.31.76 =8.3(1.24+1.76)=8.33=24.9 99991001 =9999(1000+1)=99991000+99991 =10008999 14.86.3-6.36.58.33.7 =(14.8-6.5)6.3 8.33.7=8.36.3+8.33.7 8.3(6.33.7) =8.310 =83 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+

2、0.78 =10.78 933-157-43 =933-(157+43 )=933-200=733 4821-998 =4821-1000+2=3823 I3212525 =4812525 =(425)(8125)=1001000 =1000009048268 =(2600+2600+2600+1248)26=260026+260026+260026+1248269 =100+100+100+48=3482881 43 =(1290+1591) 434=129043+159143=30+373.242.33.75-12.50.42316=3.242.33.75-1.2542.31.6=42.3

3、(3.23.75-1.251.6)=42.3(40.83.75-1.2540.4)=42.3(40.423.75-1.2540.4)=42.3(4x0.4x7.5-1.25x4x0.4)=42.340.4(7.5-1.25)=42.340.46.25 =42.3(42.5)=4237 1.8+181.5-0.50.3 =1.8+12-0.15=13.8-0.15=13.656.58+3.58-47 =52+28-47=80-47(80-9.8)5 分之 2-1.32 =70.2X2/5-1.32=28.08-1.32=26.7687 分之 41(3.2-2.95)=84/710.25=84/7

4、4=8/72700(506499)900 =27007900 =18900900 =21 33.02(148.490.85)2.5=33.0257.552.5=33.0223.02 =10(111)5.1 =(11)5.1 =05.1 =018.1(30.2990.23)1=18.11.71 =18.11.7 =19.8-18+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 1.1

5、25+-17/5+-1/8+-0.6= -3 -98+76+(-87)*2356+(-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

6、*8/30/(-2)-3 (-84)/2*(-3)/(-6) 1/2*(-4/15)/2/3 -3x+2y-5x-7y14372727563 75-(12+18 ) 15 2160(83-79)18 280840245 32513(266250) 85(95144024) 58870(105202) 14372727563 81432(135278) 37.85-(7.85+6.4 ) 30 156(17.7-7.2)3 (947599)7664 36(913 27623) 192(5438)67 ( 7.1-5.6)0.9-1.152.5 81432(135278) 5.42.6( 3.7-

7、2.9) +0.62 (947599)7664 60(9.528.9)0.18 2.8810.430.243.5 20(2.441.8)0.40.15 28-(3.4 1.252.4) 0.815.5-(3.21 5.79) (31.8 3.24)5 19464.81.80.9 36.724.259.9 3.416(0.01635) 0.8(106.76)1.2 (136+64)(65-34523 ) (6.8-6.80.55)8.5 0.12 4.80.124.8 (58+37)(64-95) 812-700( 9+3111) (3.21.5+2.5)1.6 85+14(14+20826)

8、120-36418+35 (284+16)(512-820818 ) 9.721.6-18.3057 4/71/3(3/5-3/10 ) (4/5+1/4)7/3+7/10 12.780( 13.4156.6 ) 37.812-700(9+3111 ) (136+64)(65-34523 ) 3.2(1.5+2.5)1.6 85+14(14+20826) (58+37 )(64-95) (6.8-6.80.55)8.5 (284+16)(512-820818) 0.12 4.80.124.8 (3.21.5+2.5)1.6 120-36418+35 10.15-10.750.4-5.7 5.8

9、(3.87-0.13 )+4.23.74 347+452-416052 32.52-(6+9.7283.2)2.5 87(58+37 ) (64-95 ) ( 7.1-5.6)0.9-1.15 2.5 (3.21.5+2.5)1.6 5.42.6( 3.7-2.9) +0.62 126(12-7.2)-6 3.26+(1.5+2.5)1.6 (3.21.5+2.5)1.6 5.8(3.87-0.13 )+4.23.74 33.02(148.490.85)2.51)23+(-73) (2)(-84)+(-49) (3)7+(-2.04) (4)4.23+(-7.57) (5)(-7/3)+(-7

10、/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)|-|1-5/4-|-3/4|) (15)(-2/199)*(-7/6-3/2+8/3) (16)4a)*(-3b)*(5c)*1/6 1. 3/7 49/9 -

11、4/3 2. 8/9 15/36 + 1/27 3. 12 5/6 2/9 3 4. 8 5/4 + 1/4 5. 6 3/8 3/8 6 6. 4/7 5/9 + 3/7 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 5/6 + 5/6 10. 3/4 8/9 - 1/3 0.121.80.9=7.2 (95)0.3=1.02 6.4-=28+4.4 11. 7 5/49 + 3/14 12. 6 ( 1/2 + 2/3 ) 13. 8 4/5 + 8 11/5 14. 31 5/6 5/6 15. 9/7 - ( 2/7 10/

12、21 ) 16. 5/9 18 14 2/7 17. 4/5 25/16 + 2/3 3/4 18. 14 8/7 5/6 12/15 19. 17/32 3/4 9/24 20. 3 2/9 + 1/3 21. 5/7 3/25 + 3/7 22. 3/14 2/3 + 1/6 23. 1/5 2/3 + 5/6 24. 9/22 + 1/11 1/2 25. 5/3 11/5 + 4/3 26. 45 2/3 + 1/3 15 27. 7/19 + 12/19 5/6 28. 1/4 + 3/4 2/3 29. 8/7 21/16 + 1/2 30. 101 1/5 1/5 21 31.5

13、016040 (58+370)(64-45) 32.120-14418+35 33.347+452-416052 34(58+37)(64-95) 35.95(64-45) 36.178-14556+42 420+580-642128 37.812-700(9+3111) (136+64) (65-34523) 38.85+14(14+20826) 39.(284+16)(512-820818) 40.120-36418+35 41.(58+37)(64-95) 42.(6.8-6.80.55)8.5 43.0.12 4.80.124.8 44.(3.21.5+2.5)1.6 (2 )3.2

14、(1.5+2.5)1.6 45.6-1.64= 5.38+7.85-5.37= 46.7.20.8-1.25= 6-1.193-0.43= 47.6.5(4.8-1.24)= 0.681.9+0.321.9 48.10.15-10.750.4-5.7 49.5.8(3.87-0.13)+4.23.74 50.32.52-(6+9.7283.2 )2.5 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+3

15、x42/2x(3x8) 57.9x8x7/5x(4+6) 58.11x22/(4+12/2) 59.94+(-60)/10 1. a3-2b3+ab(2a-b) =a3+2a2b-2b3-ab2 =a2(a+2b)-b2(2b+a) =(a+2b)(a2-b2) =(a+2b)(a+b)(a-b) 2. (x2+y2)2-4y(x2+y2)+4y2 =(x2+y2-2y)2 3. (x2+2x)2+3(x2+2x)+x2+2x+3 =(x2+2x)2+4(x2+2x)+3 =(x2+2x+3)(x2+2x+1) =(x2+2x+3)(x+1)2 4. (a+1)(a+2)+(2a+1)(a-2

16、)-12 =a2+3a+2+2a2-3a-2-12 =3a2-12 =3(a+2)(a-2) 5. x2(y+z)2-2xy(x-z)(y+z)+y2(x-z)2 =x(y+z)-y(x-z)2 =(xz+yz)2 =z2(x+y)2 6. 3(a+2)2+28(a+2)-20 =3(a+2)-2(a+2)+10 =(3a+4)(a+12) 7. (a+b)2-(b-c)2+a2-c2 =(a+b)2-c2+a2-(b-c)2 =(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+1)(x2+x-1

17、)-2 =(x2+x)(x2+x-1)-2 =(x2+x)2-(x2+x)-2 =(x2+x-2)(x2+x+1) =(x+2)(x-1)(x2+x+1) 1. 3/7 49/9 - 4/3 2. 8/9 15/36 + 1/27 3. 12 5/6 2/9 3 4. 8 5/4 + 1/4 5. 6 3/8 3/8 6 6. 4/7 5/9 + 3/7 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 5/6 + 5/6 10. 3/4 8/9 - 1/3 0.121.80.9=7.2 (95)0.3=1.02 6.4-=28+4.4

18、 11. 7 5/49 + 3/14 12. 6 ( 1/2 + 2/3 ) 13. 8 4/5 + 8 11/5 14. 31 5/6 5/6 15. 9/7 - ( 2/7 10/21 ) 16. 5/9 18 14 2/7 17. 4/5 25/16 + 2/3 3/4 18. 14 8/7 5/6 12/15 19. 17/32 3/4 9/24 20. 3 2/9 + 1/3 21. 5/7 3/25 + 3/7 22. 3/14 2/3 + 1/6 23. 1/5 2/3 + 5/6 24. 9/22 + 1/11 1/2 25. 5/3 11/5 + 4/3 26. 45 2/3

19、 + 1/3 15 27. 7/19 + 12/19 5/6 28. 1/4 + 3/4 2/3 29. 8/7 21/16 + 1/2 30. 101 1/5 1/5 21 31.5016040 (58+370)(64-45) 32.120-14418+35 33.347+452-416052 34(58+37)(64-95) 35.95(64-45) 36.178-14556+42 420+580-642128 37.812-700(9+3111) (136+64) (65-34523) 38.85+14(14+20826) 39.(284+16)(512-820818) 40.120-3

20、6418+35 41.(58+37)(64-95) 42.(6.8-6.80.55)8.5 43.0.12 4.80.124.8 44.(3.21.5+2.5)1.6 (2 )3.2 (1.5+2.5)1.6 45.6-1.64= 5.38+7.85-5.37= 46.7.20.8-1.25= 6-1.193-0.43= 47.6.5(4.8-1.24)= 0.681.9+0.321.9 48.10.15-10.750.4-5.7 49.5.8(3.87-0.13)+4.23.74 50.32.52-(6+9.7283.2 )2.5 51.-5+58+13+90+78-(-56)+50 52.

21、-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+3x42/2x(3x8) 57.9x8x7/5x(4+6) 58.11x22/(4+12/2) 59.94+(-60)/10 1. a3-2b3+ab(2a-b) =a3+2a2b-2b3-ab2 =a2(a+2b)-b2(2b+a) =(a+2b)(a2-b2) =(a+2b)(a+b)(a-b) 2. (x2+y2)2-4y(x2+y2)+4y2 =(x2+y2-2y)2 3. (x2+2x)2+3(x2+2x

22、)+x2+2x+3 =(x2+2x)2+4(x2+2x)+3 =(x2+2x+3)(x2+2x+1) =(x2+2x+3)(x+1)2 4. (a+1)(a+2)+(2a+1)(a-2)-12 =a2+3a+2+2a2-3a-2-12 =3a2-12 =3(a+2)(a-2) 5. x2(y+z)2-2xy(x-z)(y+z)+y2(x-z)2 =x(y+z)-y(x-z)2 =(xz+yz)2 =z2(x+y)2 6. 3(a+2)2+28(a+2)-20 =3(a+2)-2(a+2)+10 =(3a+4)(a+12) 7. (a+b)2-(b-c)2+a2-c2 =(a+b)2-c2+a2-(b-c)2 =(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+1)(x2+x-1)-2 =(x2+x)(x2+x-1)-2 =(x2+x)2-(x2+x)-2 =(x2+x-2)(x2+x+1)=(x+2)(x-1)(x2+x+1)

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