初一数学计算题及答案

1、初一数学计算题及答案1.25 X (8+10) = 1.25 X 8+1.25 X 10= 10+12.5=22.59123- (123+8.8)=9123-123-8.8=9000-8.8=8991.21.24 X 8.3+8,3 X 1.76=8.3 X ( 1.24+1.76)=8,3 X 3=24.99999X1001=9999X ( 1000+1)=9999X1000+9999 X 1=1000899914.8 X 6.3-6.3 X6.5 +8,3 X 3,7=(14.8-6.5 ) X 6.3 +8,3 X 3,7=8,3 X 6.3+8,3 X3,78.3 X (6.3 +3.

2、7)=8,3 X 10=831.24+0.78+8.76=(1.24+8,76 ) +0.78 = 10+0,78= 10.78933-157-43=933- (157+43)=933-200=7334821-998=4821-1000+2=3823I32 X 125X25=4X8X 125X25=(4X25) X ( 8X 125)=100X1000=1000009048+268=(2600+2600+2600+1248 + 26=2600+ 26+2600+ 26+2600+ 26+1248+ 269=100+100+100+48=3482881 + 43=(1290+1591) + 43

3、4= 1290+ 43+1591 + 43=30+373.2 X42.3 X 3.75-12.5 X 0.423 X 16=3,2 X42.3 X 3.75-1.25 X 42.3 X 1.6=42.3 X (3.2 X 3.75-1.25 X 1.6)=42.3 X (4 X0,8 X 3.75-1.25 X4X0.4)=42.3 X(4 X0.4 X2X3.75-1.25 X4X 0.4)=42.3 X (4x0,4x7.5-1.25x4x0.4)=42,3 X 4 X0,4 X (7.5-1.25)=42,3 X 4 X0.4 X6,25=42.3 X (4 X2.5)=42371.8+

4、18 + 1.5-0.5 X 0,3= 1.8+12-0.15= 13.8-0.15= 13.656.5 X 8+3,5 X8-47=52+28-47=80-47(80-9.8) X5 分之 2-1.32=70.2X2/5-1.32 =28.08-1.32=26.76 8X7 分之 4-1 -(3.2-2,95)=8X4/7 + 1 -0.25=8X4/7 +4=8/72700X (506-499) -900=2700X7-900= 18900-900=2133.02 - ( 148.4 -90,85) + 2.5=33.02 -57.55 +2.5=33.02 -23.02=10(1-1-1

5、) -5.1=(11) +5.1=0-5.1=018.1 + ( 3-0.299 -0.23) X 1= 18.1 +1.7 X 1= 18.1 +1.7= 19.8-18+29+-52+60= 19请浏览后下载，资料供参考，期待您的好评与关注!1/2*(-4/15)/2/3301+125+301+-75= 50卜1+-1/2+3/4+-1/4= -117/2+5/6+-0.5+4/5+19/6= 1.25卜26.54+-6.14+18.54+6.14= -81.125+-17/5+-1/8+-0.6= -3卜98+76+(-87)*2356+(-75)-(7)-(8+4+3)5+21*8/2

6、-6-5968/21-8-11*8+61-2/9-7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/122/3-4-1/4*(-0.4)/1/3+222+(-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)/1/218-6/(-3)*(-2)(5+3/8*8/30/(-2)-3(-84)/2*(-3)/(-6)-3x+2y-5x-7y1437X 27+27X563 75- (12+18)+152160+(83-

7、79) X 18280 + 840-24X5325+13X(266250) 85 X (95-1440-24)58870+ (105 +20X 2) 1437 X27+27X56381432+(13 X 52+78) 37.85-(7.85+6.4 ) X 30156 X (17.7-7.2)+3(947-599) + 76X6436X(913 276+23) 192 (54+38) X 67(7.1-5.6 ) X 0.9-1.15 +2.5 81432 +(13 X52+78)5.4 +2.6 X (3.7-2.9 )+0.62 (947-599)+76X64 60-(9.5 +28.9)

8、 + 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 X2.4) 0.8 X15.5-(3.21 5.79)(31.8 3.2 X4) +5 19464.8 + 1.8 X0.9 36.72 +4.25 X9.9 3.416 + (0.016 X 35) 0.8 X(10 -6.76) +1.2(136+64) X ( 65-345 + 23) (6.8-6.8 X 0.55) +8.50.12 X 4.8 +0.12 X4.8(58+37) + ( 64-9 X5)812-700 + ( 9+31X

9、 11)(3.2 X 1.5+2.5 ) + 1.685+14X ( 14+208+26) 120-36 X 4+18+35(284+16) X ( 512-8208+ 18) 9.72 X 1.6-18.305 +74/7 +1/3 X (3/5-3/10 ) (4/5+1/4 ) +7/3+7/1012.78 0+ ( 13.4 +156.6 ) 37.812-700 + (9+31X 11)(136+64)请浏览后下载，资料供参考，期待您的好评与关注！X (65-345 +23) 3.2 X ( 1.5+2.5 ) + 1.685+14X ( 14+208+26)(58+37) + (

10、64-9 X5)(6.8-6.8 X 0.55) +8.5(284+16) X ( 512-8208 + 18)0.12X4.8+0.12X4.8 (3.2 X 1.5+2.5 ) +1.6120-36 X 4+18+35 10.15-10.75 X 0.4-5.75.8 X (3.87-0.13 ) +4.2 X 3.74 347+45 X 2-4160-5232.52- (6+9.728 + 3.2) X 2.5 87 (58+37) + ( 64-9 X5) (7.1-5.6 ) X 0.9-1.15+2.5 (3.2 X 1.5+2.5 ) +1.65.4 +2.6 X (3.7-2.

11、9 ) +0.62 12 X 6+ (12-7.2) -6 3.2 X6+ (1.5+2.5 ) +1.6(3.2 X 1.5+2.5 ) +1.65.8 X (3.87-0.13 ) +4.2X3.7433.02 - ( 148.4 90.85) + 2.51)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)

12、+(-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)*1/61. 3/7 X 49/9 - 4/32. 8/9 X 15/36 + 1/273. 12 X 5/6- 2/9 X34. 8 X 5/4 + 1/45. 6 + 3/8 3/8 +66. 4/7 X 5/9 + 3/7 X 5/97. 5/2 -( 3/2 +

13、4/5)8. 7/8 +( 1/8 + 1/9)9. 9 X 5/6 + 5/610. 3/4 X 8/9 - 1/30.12 x + 1.8 X0.9=7.2 (9 -5Z ) X 0.3=1.02 6.4 z - z =28+4.411. 7 X 5/49 + 3/1412. 6 X ( 1/2 + 2/3)13. 8 X 4/5 + 8 X 11/514. 31 X 5/6 - 5/615. 9/7 -( 2/7 - 10/21 )请浏览后下载，资料供参考，期待您的好评与关注!16. 5/9 X 1814 X 2/717. 4/5 X 25/16 + 2/3 X 3/418. 14 X

14、8/7 - 5/6 X 12/1519. 17/32- 3/4 X 9/2420. 3 X 2/9 + 1/321. 5/7 X 3/25 + 3/722. 3/14 XX 2/3 + 1/623. 1/5 X 2/3 + 5/624. 9/22 + 1/11+ 1/225. 5/3 X 11/5 + 4/326. 45 X 2/3 + 1/3 X 1527. 7/19 + 12/19 X 5/628. 1/4 + 3/4+ 2/329. 8/7X 21/16 + 1/230. 101X 1/5 - 1/5 X 2131. 50 +160 + 40 (58+370) + ( 64-45)32.

15、120-144 +18+3533.347+45 X 2-4160 +5234 (58+37) + ( 64-9 X5)35.95 + (64-45)36.178-145 +5X6+42 420+580-64 X 21 + 2837.812-700 + (9+31X11)(136+64) X ( 65-345 + 23)请浏览后下载，资料供参考，期待您的好评与关注！38.85+14 X ( 14+208+26) 39. (284+16) X ( 512-8208 + 18)40.120-36 X4+18+3541. (58+37) + ( 64-9 X 5)42.(6.8-6.8 X0.55)

16、+8.543.0.12 X 4.8 +0.12 X4.844. (3.2 X 1.5+2.5 ) +1.6(2) 3.2 X (1.5+2.5) +1.645.6-1.6 +4= 5.38+7.85-5.37=46.7.2 +0.8-1.2 X 5= 6-1.19 X 3-0.43=47.6.5 X (4.8-1.2 X4) = 0.68 X 1.9+0.32 X 1.948.10.15-10.75 X 0.4-5.749.5.8 X (3.87-0.13 ) +4.2 X3.7450.32.52- (6+9.728 +3.2 ) X 2.551.-5+58+13+90+78-(-56)+50

17、52.-7*2-57/(353.(-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)/101.aA3-2bA3+ab(2a-b)=aA3+2aA2b-2bA3-abA2=aA2(a+2b)-bA2(2b+a)=(a+2b)(aA2-bA2)=(a+2b)(a+b)(a-b)2.(xA2+yA2)A2-4y(xA2+yA2)+4yA2=(xA2+yA2-2y)A23.(xA2+2x)A2+3

18、(xA2+2x)+xA2+2x+3=(xA2+2x)A2+4(xA2+2x)+3=(xA2+2x+3)(xA2+2x+1)=(xA2+2x+3)(x+1)A24.(a+1)(a+2)+(2a+1)(a-2)-12=aA2+3a+2+2aA2-3a-2-12=3aA2-12=3(a+2)(a-2)5.xA2(y+z)A2-2xy(x-z)(y+z)+yA2(x-z)A2=x(y+z)-y(x-z)A2=(xz+yz)八2 =zA2(x+y)A26.3(a+2)A2+28(a+2)-20=3(a+2)-2(a+2)+10=(3a+4)(a+12)7.(a+b)A2-(b-c)A2+aA2-cA2=

19、(a+b)A2-cA2+aA2-(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+1)(xA2+x-1)-2=(xA2+x)(xA2+x-1)-2=(xA2+x)A2-(xA2+x)-2=(xA2+x-2)(xA2+x+1)=(x+2)(x-1)(xA2+x+1)1. 3/7 X 49/9 - 4/32. 8/9 X 15/36 + 1/273. 12 X 5/6- 2/9 X34. 8 X 5/4 + 1/45. 6 + 3/8 3/8 +66. 4/7 X 5/9 + 3/7 X 5/

20、97. 5/2 -( 3/2 + 4/5)8. 7/8 +( 1/8 + 1/9)9. 9 X 5/6 + 5/610. 3/4 X 8/9 - 1/30.12 x + 1.8 X0.9=7.2 (9 -5Z ) X 0.3=1.02 6.4 z - z =28+4.411. 7 X 5/49 + 3/1412. 6 X ( 1/2 + 2/3)13. 8 X 4/5 + 8 X 11/514. 31 X 5/6 - 5/615. 9/7 -( 2/7 - 10/21 )16. 5/9 X 18 - 14 X 2/717. 4/5 X 25/16 + 2/3 X 3/418. 14 X 8/7

21、 - 5/6 X 12/1519. 17/32- 3/4 X 9/2420. 3 X 2/9 + 1/321. 5/7 X 3/25 + 3/722. 3/14 XX 2/3 + 1/623. 1/5 X 2/3 + 5/624. 9/22 + 1/11+ 1/225. 5/3 X 11/5 + 4/3请浏览后下载，资料供参考，期待您的好评与关注!48.10.15-10.75 X0.4-5.727. 7/19 + 12/19 X 5/628. 1/4 + 3/4+ 2/329. 8/7X 21/16 + 1/230. 101 X 1/5 - 1/5 X 2131. 50 +160 + 40 (

22、58+370) + ( 64-45)32.120-144 +18+3533.347+45 X 2-4160 +5234 (58+37) + ( 64-9 X5)35.95 + (64-45)36.178-145 +5X6+42 420+580-64 X 21 + 2837.812-700 + (9+31X11)(136+64) X ( 65-345 + 23)38.85+14 X ( 14+208+26)39. (284+16) X ( 512-8208 + 18)40.120-36 X4+18+3541. (58+37) + ( 64-9 X 5)42.(6.8-6.8 X0.55) +8.

23、543.0.12 X 4.8 +0.12 X4.844. (3.2 X 1.5+2.5 ) +1.6(2) 3.2 X (1.5+2.5) +1.645.6-1.6 +4= 5.38+7.85-5.37=46.7.2 +0.8-1.2 X 5= 6-1.19 X 3-0.43=47.6.5 X (4.8-1.2 X4) = 0.68 X 1.9+0.32 X 1.949.5.8 X (3.87-0.13 ) +4.2 X3.7450.32.52-(6+9.728 +3.2 ) X 2.551.-5+58+13+90+78-(-56)+5052.-7*2-57/(353.(-7)*2/(1/3)+79/(3+6/4)54.123+456+789+98/(-4)