初一数学计算题及答案

1、初一数学计算题及答案1.25x (8+10) = 1.25x8+1.25x10= 10+12.5=22.59123- (123+8.8)=9123-123-8.8=9000-8.8=8991.21.24x8.3+8.3x1.76二8.3x (1.24+1.76)=8.3x3=24.99999x1001=9999x (1000+1)=9999x1000+9999x1=1000899914.8x6.3-6.3x6.5 + 8.3x3.7二(14.8-6.5) x6.3 +8.3x37二 8.3x6.3+8.3x378.3x (6.3 + 3.7)=8.3x10二 831.24+0.78+8.76二

2、(1.24+8.76) +0.78= 10+0.78二 10.78933-157-43=933- (157+43)=933-200二 7334821-998=4821-1000+2二 3823132x125x25=4x8x125x25二(4x25) x (8x125)=100x1000=1000009048-268二(2600+2600+2600+1248) -26=2600-26+2600-26+2600-26 + 1248-269=100+100+100+48=3482881- 43(1290+1591) - 434=28.08-1.32=1290-43+1591-43=30+373.2x

3、42.3x3.75-12.5x0.423x16=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)=42.3x4x0.4x(7.5-1.25)=42.3x4x0.4x6.25二 42.3x(4x2.5)=42371.8 + 18-1.5-0.5x0.3= 1.8+12-0.15= 13.8-0.15二 13.656.5x8+3.5x8-47二52+28-47二8

4、0-47(80-9.8)x5 分之 2-1.32=70.2X2/5-1.32二 26.768x7 分之 4-1-(3.2-2.95)=8x4/7-1-0.25=8x4/7-4二 8/72700x (506-499) -900=2700x7-900二 18900900=2133.02 - (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 018.1 + (3-0.299-0.23) xl= 18.1 + 1.7x1= 18.1 + 1.7二 19.8 -18J+29+-52+60= 1

5、9-3+-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= -81.125+-17/5+-1/8+-0.6= -3-98+76+(-87)*2356+(-75)-(7)-(8+4+3)5+21*8/2-6-5968/21-8-11*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

6、+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)1/2*(-4/15)/2/3-3x+2y-5x-7y1437x27 + 27x563(75- (12 + 18) -152160- (83-79) xl8 280 + 840-24x5325-13x(266 - 250) 85x(95 - 1440-24)58870-(105 十 20x2) 1437x27 + 27x563

7、81432-(13x52+ 78) 37.85- (7.85+6.4) x30156x(17.7-7.2)-3(947 - 599) +76x6436x(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 1.25x2.4) 0.8x (15.5-(3.21 5.79)(

8、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)三8.50.12x 4.8-0.12x4.8(58+37) - (64-9x5)812-700- (9+31x11)(3.2xl.5+2.5) -1.685+14x (14+208-26)120-36x4-18+35(284+16) x (512-8208-18)9.72x1.6-18.305-74/7-1/3x (3/5-3/10) (4/5+1/4) -7

9、/3+7/1012.78-0- ( 13.4 + 156.6 ) 37.812-700- (9+31x11)(136+64) x(65-345-23)3.2x (1.5+2.5) -1.63.2X6+ (L5+25)小 1.6 (3.2XL5+25)小1.6 500X (3.870.13) +42X3.74 3302 (148.4 90.85)小251)23+(173)(2) (84)+(49)(3) 7+(204)(44.23+(7.57)(5) 7、3)+(7、6)(6) 9、4+(3、2)(7) 3.75+(225)+5、4(8) 3.75+(+5、4)+(L5)(9) (17、4)+(

10、10、3)+(+13、3)+(11、3)(10) (1.8)+0.2)+(1.7)+pl)+(+1.8)+(+1.4)(11) (+1.3)丄+17、7)85+14X (14+208小26) (58+37) (649X5) (6.86.8XP55T85 (284+16) X (5128208 小一8) 0.12X 48小0.12X4.8 (3.2X1.5+2.5)小一.6 12036x4418+35 10.15 10.75X0.45.7 50OX (3.87P13) +4.2X3.74 347+45x24160 小 52 3252 (6+9.728小3-2) X2.5 87 (58+37) (

11、649X5) (7.15.6) X0.91.15小 2.5 (3.2X1.5+25) 41.6 5.4 上 2.6X (3.729) +P6212x6 小(127.2) 67- 5、2 ( 3、2 + 4、5 )8 7、8 十(1、8 + 1、9 )9 9 X 5、6 + 5、6lp3、4 x 8、9 1、302x + 1OOX0.9H7.2 (9 I 5x)xo.3nlo2 6.4XXH28+44IL 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、

12、9 x 一8 114 X 2、7(12) (2)丄+2、3)(13) 卞 7.2)V6.3)+(L1)一(14) _(5、4)丄3、4)-丄 15、4丄3、4_)(15) (2、199)v7、63、2+8、3)(164a)v3b)*(5c)*l、6L 3、7 X 49、9 4、32. 8、9 X 15、36 + 1、273 12 X 5、6 12、9 X 34 8 X 5、4 + 1、45 6-I-3、8|3、8-I-66 4、7 X 5、9 + 3、7 X 5、917. 4/5 x 25/16 + 2/3 x 3/418. 14 x 8/7 一 5/6 x 12/1519. 17/32 -

13、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. 8/7 x 21/16 + 1/230. 101 x 1/5 - 1/5 x 2131.50 + 160-40(58+370) - (64-45)32.120-144-18+3533.347+45x2-4160

14、-5234 (58+37) - (64-9x5)35.95三(64-45)36.178-145-5x6+42 420+580-64x21-2837.812-700- (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+3541. (58+37) - (64-9x5)42. (6.86.8x0.55)三 8.543.0.12x 4.8-0.12x4.844. (3.2xl.5+2.5) -1.6(2) 3.2x (1.5+2.5) -1.645.6-1.6-

15、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+0.32x1.948.10.15-10.75x0.4-5.749.5.8x (3.87-0.13) +4.2x3.7450.32.52- (6+9.728-3.2) x2.551. -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)55.369/33-(-54-31/15.5)56.39+3x42/2x(3x8)57

16、.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(xA2+2x)+xA2+2x+3=(xA2+2x)A2+4(xA2+2x)+3=(xA2+2x+3)(xA2+2x+l)=(xA2+2x+3)(x+l)A24.(a + l)(a+2)+(2a + l)(a

17、-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)A2(o+e)(？q + p)ZH &+q p+o+q + e)?q + p)z: &+q e)(oq + e)+(oq + p)(o+q + p)H Zv(oq)0e+g0(q+ell CXJvozve+zoq)zq + e)L(zt+e)(寸+BO0TI o-c+CN+e)=CXJ(0 + e)ooH oCXJ(CXJ+e)8z+z0+e)w9 cxjv(a+x)cxjr98

18、、00|8、；9 寸二+寸J5X 8 寸 cox 6、CXJl9、LnXE w + 9EV2X 6、8 Z 6、6寸 X27O0Q (c+x+zvx)(x)(z+xll a+x+CMVXKZx+zvxn z(x+CMvx)zx+zvxn CXJ(Ix+*x)(x+0vxf CXJnx+CXJvx)n+x)x006. 4/7 x 5/9 + 3/7 x 5/97. 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/ 十 1.8x0.9二7.2 (9 一 5x”0.3二 1.02 6似-X

19、二28+4411. 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 一 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 一 5/6 x 12/1519. 17/32 - 3/4 x 9/2420. 3 x 2/9 + 1/321. 5/7 x 3/25 十 3/722. 3/14 xx 2/3 + 1/623. 1/5 x 2/3 + 5/624. 9/22 + 1/11 -

20、1/225. 5/3 x 11/5 + 4/326. 45 x 2/3 + 1/3 x 1538.85+14X (14+208小26)39(284+16) X (5128208小18)4P12036X4小 18+354L (58+37)小(649X5)42.(6.86.8xo.55t8.543.0.12X 4840.12X4.844 (3.2XL5+2.5) 41.6 (2) 3.2X (1.5+2.5)45.6 1.644“ 5.38+7.855.37H46.7.240.8L2X5H 6L19X30.43H4765X (48 1.2X4) H 0.68XL9+0.32X1.9481O1510

21、.75X0.45.7627. 7、19 + 12、19 X 5、628 1、4 + 3、4 小 2、329 8、7 X 21、16 + 1、23P101 x 1、5|1、5 X 213L50 + 160小40 (58+370) (6445)32120 144小 18+3533.347+45x2416045234 (58+37)小(649X5)35.95小(6445)36.178 145小5X6+42 420+58064x2142837.812700小(9+31x11) (136+64) X (65345423)49.5.8x (3.87-0.13) +4.2x3.7450.32.52- (6+9.728-3.2) x2.551. -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)55.369/33-(-54-31/15.5)5