(完整版)初一100道数学计算题及答案

1、1.25X(8+10)=1.25 X8+1.25X10=10+12.5=22.59123-(123+8.8)=9123-123-8.8=9000-8.8=8991.21.24 X8.3+8.3X1.76=8.3X(1.24+1.76)=8.3X3=24.99999X1001=9999X(1000+1)=9999X1000+9999X1=1000899914.8 X6.3-6.3X6.5+8.3X3.7=(14.8-6.5)X6.3+8.3X3.7=8.3 X6.3+8.3X3.78.3X(6.3+3.7)=8.3X10=831.24+0.78+8.76=(1.24+8.76)+0.78=(12

2、90+1591)-434=10+0.78=10.78933-157-43=933-(157+43)=933-200=7334821-998=4821-1000+2=3823I32X125X25=4X8X125X25=(4X25) X(8X125)=100X1000=1000009048-268=(2600+2600+2600+1248)-26=2600-26+2600-26+2600-26+1248=100+100+100+48=3482881-43=1290-43+1591-43-269=30+373.2X42.3X3.75-12.5 X0.423X16=3.2X42.3X3.75-1.25

3、X42.3X1.6=42.3X(3.2X3.75-1.25X1.6)=42.3X(4X0.8X3.75-1.25X4X0.4)=42.3X(4X0.4X2X3.75-1.25X4X0.4)=42.3X(4x0.4x7.5-1.25x4x0.4)=42.3 X4X0.4X(7.5-1.25)=42.3 X4X0.4X6.25=42.3X(4X2.5)=42371.8+18+1.5-0.5X0.3=1.8+12-0.15=13.8-0.15=13.656.5X8+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

4、=26.768X7分之4 -1 +(3.2-2.95)=8X4/7 -1 -0.25=8X4/7+4=8/72700X(506499)+900=2700X7+900=18900+900=2133.02(148.490.85)+2.5=33.0257.55 -2.5=33.0223.02=10(1+11)+5.1=(11)+5.1=0 -5.1=018.1+(30.299 -0.23)X1=18.1+1.7X1=18.1+1.7=19.8卜18+29+-52+60= 19卜3+-2+-1+0+1+2= -31/2*(-4/15)/2/3卜301+125+301+-75= 50卜1+-1/2+3/

5、4+-1/4= -1卜7/2+5/6+卜0.5+4/5+19/6= 1.25卜26.54+卜6.14+18.54+6.14= -81.125+-17/5+-1/8+卜0.6= -3卜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+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)2/(-2)+0

6、/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)3.2X(1.5+2.5) -1.685+14X(14+208 -26)(58+37) -(64-9 X5)-3x+2y-5x-7y1437X27+27X56375-(12+18)-152160-(83-79)X18280+840-24 X5325-13X(266250) 85X(951440-24)58870讯105+20X2) 1437X27+27 X56381432讯13X52+78) 37.85-(7.85+6.4)X301

7、56 X(17.7-7.2)-3(947599)+76 X6436X(913276-23) 192(54+38) X67(7.1-5.6)X0.9-1.15-2.5 81432 -(13 X52+78)5.4 -2.6X (3.7-2.9)+0.62(947599) +76X64 60(9.5+28.9) -0.18 2.881-0.430.24X3.5 20 X(2.441.8)-0.4+0.15 28-(3.41.25X2.4) 0.8X15.5-(3.215.79)(31.8 3.2X4)-519464.8-1.8 X0.9 36.72-4.25X9.9 3.416- (0.016X35

8、)0.8 X(106.76)-1.2(136+64)X(65-345-23)(6.8-6.8X0.55)-8.50.12X4.8 -0.12X4.8(58+37) -(64-9X5)812-700-(9+31X11)(3.2X1.5+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)-7/3+7/1012.780-(13.4+156.6)37.812-700-(9+31X11)(136+64)X(65-345-23)(12)(-2)

9、-(+2/3)(6.8-6.8X0.55) -8.5(284+16)X(512-8208-18)0.12 X 4.8 -0.12X4.8(3.2X1.5+2.5) -1.6120-36X4-18+35 10.15-10.75X0.4-5.75.8X(3.87-0.13)+4.2X3.74 347+45X2-4160-5232.52-(6+9.728-3.2)X2.5 87(58+37)-(64-9X5)(7.1-5.6)X0.9-1.15-2.5(3.2X1.5+2.5)-1.65.4 -2.6X(3.7-2.9)+0.62 12X6-(12-7.2)-63.2 X6+(1.5+2.5)-1.

10、6(3.2X1.5+2.5) -1.65.8X(3.87-0.13)+4.2X3.7433.02(148.490.85)-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)+(-1.7)+(0.1)+(+1.8)+(+1.4)(11) (+1.3)-(+17/7)17. 4/5X25/

11、16 + 2/3X3/4(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)*1/61.3/7X49/9 - 4/32. 8/9X15/36 + 1/273. 12X:5/ 6-2/9X34. 8X5/4+ 1/45. 6-3/8-3/8北6. 4/7X5/9 + 3/7X5/97. 5/2 -(3/2 + 4/5)8. 7/8 +(1/8 + 1/9)9. 9X5/6 + 5/610. 3/4X8/9 - 1/30.12x+1.8X0

12、.9=7.2 (95X)X0.3=1.02 6.411. 7X5/49 + 3/1412. 6X(1/2 + 2/3)13. 8X4/5 + 8X11/514. 31X5/65/615. 9/7 -(2/710/21)XX=28+4.417. 4/5X25/16 + 2/3X3/416. 5/9X1814X2/738.85+14X(14+208-26)39.(284+16)X(512-8208-18)18. 14 X 8/7-5/6 X 12/1519. 17/32-3/4X9/2420. 3X2/9 + 1/321. 5/7X3/25 + 3/722. 3/14XX2/3 + 1/623.

13、1/5X2/3 + 5/624. 9/22 + 1/11-1/225. 5/3X11/5 + 4/326. 45X2/3 + 1/3X1527. 7/19 + 12/19X5/628. 1/4 + 3/4-2/329. 8/7X21/16 + 1/230. 101X1/51/5X2131.50+160-40(58+370)-(64-45)32.120-144-18+3533.347+45X2-4160-5234(58+37)-(64-9X5)35.95-(64-45)36.178-145-5X6+42 420+580-64X21-2837.812-700-(9+31X11)(136+64)X(

14、65-345 -23)1.40.120-36X4+18+3541.(58+37) + (64-9X5)42. (6.8-6.8 X0.55) -8.543.0.12X4.8 -0.12X4.844.(3.2X1.5+2.5)-1.6(2)3.2X(1.5+2.5)-1.645.6-1.6-4= 5.38+7.85-5.37=46.7.2 +0.8-1.2X5= 6-1.19X3-0.43=47.6.5X(4.8-1.2X4)= 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-

15、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)57.9x8x7/5x(4+6)58.11x22/(4+12/2)59.94+(-60)/10 aA3-2bA3+ab(2a-b)=zA2(x+y)A2=aA3+2aA2b-2bA3-abA2=aA2(a+2b)-bA2(2b+a)=(a+2b)(aA2-bA2)=(a+2b)(a+b)(a-b)2.(xA2+yA2)A

16、2-4y(xA2+yA2)+4yA2=仪人2+丫人2-2丫)人23.(xA2+2x)A2+3(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-zF2=x(y+z)-y(x-z)F2=(xz+yz)A26. 4/7X5/9 + 3/7X5/96.3(a+2F2+28(a+2)-20=3(a

17、+2)-2(a+2)+10 =(3a+4)(a+12)7.(a+b)A2-(b-c)A2+aA2-cA2=(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)1.3/7X49/9 - 4/32. 8/9X15/36 + 1/273. 12X5/62/9X34. 8X5/4 + 1/

18、45. 6-3/8-3/8北27. 7/19 + 12/19X5/67. 5/2 -(3/2 + 4/5)8. 7/8 +(1/8 + 1/9)9. 9X5/6 + 5/610. 3/4X8/9 - 1/30.12x+1.8X0.9=7.2 (95X)X0.3=1.02 6.411. 7X5/49 + 3/1412. 6X(1/2 + 2/3)13. 8X4/5 + 8X11/514. 31X5/6-5/615. 9/7-(2/7-10/21)16. 5/9X18-14X2/717. 4/5X25/16 + 2/3X3/418. 14X8/7-5/6X12/1519. 17/32-3/4X9/

19、2420. 3X2/9 + 1/321. 5/7X3/25 + 3/722. 3/14XX2/3 + 1/623. 1/5X2/3 + 5/624. 9/22 + 1/11-1/225. 5/3X11/5 + 4/326. 45X2/3 + 1/3X15XX=28+4.448.10.15-10.75X0.4-5.749.5.8X(3.87-0.13)+4.2X3.7428. 1/4 + 3/4-2/329. 8/7 X 21/16 + 1/230. 101X1/51/5X2131.50+160-40(58+370)-(64-45)32.120- 144-18+3533.347+45X2-416

20、0-5234(58+37)-(64-9X5)35.95-(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. (6.8-6.8 X0.55) -8.543.0.12X4.8 -0.12X4.844.(3.2X1.5+2.5)-1.6(2)3.2X(1.5+2.5)-1.645.6-1.6-4= 5.38+7.85-5.37=46.7.2 +0.8-1.2X5= 6-1.19X3-0.43=47.6.5X(4.8-1.2X4)= 0.68X1.9+0.32X1.9=2(a+b-c)(a+c)50.32.52-(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.