1、完整版初一100道数学计算题及答案1.25 (8+10 )=1.25 8+1.25 109123- ( 123+8.8 )1.24 8.3+8.3 =8.3 (1.24+1.76)=8.3 9999 1001=9999 (1000+1 )=9999 1000+9999 1=1000899914.8 6.3-6.3 6.5 8.3 =( 14.8-6.5 )6.3 8.3 3.7 =8.3 6.3+8.3 3.7 8.3 (6.3 3.7 )=8.3 10=83= ( ) 933-157-43=933- ( 157+43 )=933-200=7334821-998=4821-1000+2=382
2、3I32 125 25=4 8125 25=( 4 25 )( 8 125 )=100 1000=1000009048 268= ( 2600+2600+2600+1248)26=2600 26+2600 26+2600 26+1248 269=100+100+100+48=3482881 43= ( 1290+1591 ) 434=1290 43+1591 43=30+373.2 42.3 16=3.2 42.3 =42.3 (3.2 1.6)=42.3 (4 0.8 3.75-1.25 40.4)=42.3 (4 0.4 2 4 0.4)=42.3 (4x0.4x7.5-1.25x4x0.
3、4)=42.3 4 0.4 (7.5-1.25)=42.3 4 0.4 6.25=42.3 (4 2.5)=42371.8+18 1.5-0.5 6.5 8+3.5 8-47=52+28-47=80-47(80-9.8) 5 分之8 7 分之 4 1 (3.2-2.95)=8 4/7 1 0.25=8 4/7 4=8/72700 (506 499 )900=2700 7900=18900 900=2133.02 ( 148.4 90.85 )=33.02 57.55 =33.02 =10(1 1 1)5.1 = ( 1 1 )5.1 =0 5.1 =018.1 ( 3 0.299 0.23 )
4、1 =18.1 1.7 1 =18.1 -18+29+-52+60= 19-3+-2+-1+0+1+2= -3-301+125+301+-75= 50-1+-1/2+3/4+-1/4= -1-26.54+-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*
5、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)1/2*(-4/15)/2/3-3x+2y-5x-7y143727 27 563 75- ( 12+18 )152160( 83-79)18 280 840 245325 13 (266 250) 85 (95 1440 24)58870(105 20 2)1437 27 27 56381432(13 52 78)37.
6、85- () 30156 (17.7-7.2)3(947 599 ) 766436 (913 276 23) 192 ( 54 38 ) 67 ( 7.1-5.6 )0.9-1.15 2.5 81432 (13 52 78)5.4 2.6 ( 3.7-2.9 )+0.62 ( 947 599) 76 64 60(9.5 28.9) 0.24 3.5 20 (2.44 1.8) 0.4 0.152.4) 0.8 5.79) (31.8 3.2 4)5 194 64.8 1.8 0.9 36.72 4.25 9.9 3.416 (0.016 35 ) 0.8 (106.76) 1.2(136+64
7、 )(65-345 23 ) (6.8-6.8 0.55) 0.12 4.8 0.12 4.8 ( 58+37 )( 64-9 5 )812-700 (9+31 11 ) ( )85+14 (14+208 26 ) 120-36 418+35(284+16 )(512-8208 18 ) 9.72 1.6-18.305 74/7 1/3 (3/5-3/10 ) ( 4/5+1/4 )7/3+7/1012.78 0 ( 13.4 ) 37.812-700 (9+31 11 ) ( 136+64)(65-34523 )3.2 (1.5+2.5 )85+14 (14+208 26 ) ( 58+37
8、 )(64-9 5 )(6.8-6.8 0.55) 8.5 ( 284+16 )(512-8208 18 )0.12 4.8 0.12 4.8 ( 3.2 1.5+2.5 )120-36 4 () +4.2 3.74 347+45 2-4160 5232.52- ()2.5 87 ( 58+37 )(64-9 5 ) ( 7.1-5.6 )0.9-1.15( 3.2 1.5+2.5 )2.6 (3.7-2.9 ) +0.62 126(12-7.2 ) -66+ ()1.6 ( 3.2 1.5+2.5 )() +4.2 33.02 ( 148.4 90.85 )1)23+(-73)(2)(-84
9、)+(-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)(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)(
10、16)4a)*(-3b)*(5c)*1/61.3/7 49/9 - 4/32.8/9 15/36 + 1/273. 12 5/6 2/9 34.8 5/4 + 1/45.6 3/8 3/8 66.4/7 5/9 + 3/7 5/97.5/2 -( 3/2 + 4/5)8.7/8 +( 1/8 + 1/9)9.9 5/6 + 5/610.3/4 8/9 - 1/30.12 1.8 0.9=7.2 (9 5) - 11. 7 5/49 + 3/1412. 6( 1/2 + 2/3)13. 8 4/5 + 8 11/514.31 5/6 5/615.9/7 - ( 2/7 10/21 )16.5/9
11、 18 14 2/717. 4/5 25/16 + 2/3 3/418.14 8/7 5/6 12/1519.17/32 3/4 9/2420.3 2/9 + 1/321.5/7 3/25 + 3/722.3/14 2/3 + 1/623.1/5 2/3 + 5/624.9/22 + 1/11 1/225.5/3 11/5 + 4/326.45 2/3 + 1/3 1527.7/19 + 12/19 5/628.1/4 + 3/4 2/329.8/7 21/16 + 1/230.101 1/5 1/5 2131.50 16040 ( 58+370 )( 64-45 )18+3533.347+4
12、52-4160 5234 ( 58+37)( 64-9 5 )35.95 (64-45)56+42 420+580-6421 28(9+3111 ) (136+64)(65-34523 )38.85+14 (14+20826 )39. ( 284+16 )( 512-8208 18 ) 4 18+3541. ( 58+37 )(64-9 5 ) 0.55) 43.0.12 4.8 0.12 44.( 3.2 1.5+2.5 )1.6 ( 2 ) 3.2 (1.5+2.5 )45.6-1.6 4= 5.38+7.85-5.37=46.7.2 0.8-1.2 5= 6-1.19 3-0.43=47
13、.6.5 (4.8-1.2 4 ) = 0.68 1.9+0.32 48.10.15-10.75 49.5.8 (3.87-0.13 ) +4.2 50.32.52- ( 6+9.728 3.2 )51.-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)/101.a3-2b3+ab(2a-b)=a3+2a2b-
14、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)23.(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)24.(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
15、(x+y)26.3(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)1.3/7 49/9 - 4/32.8/9 15/36 + 1/273. 12 5/6 2/9 34
16、.8 5/4 + 1/45.6 3/8 3/8 66. 4/7 5/9 + 3/7 5/97.5/2-( 3/2 +4/5)8.7/8+( 1/8+ 1/9)9.9 5/6 + 5/610.3/4 8/9 - 1/30.12 1.8 0.9=7.2 (9 5) - 11. 7 5/49 + 3/1412. 6( 1/2 + 2/3)13. 8 4/5 + 8 11/514.31 5/6 5/615.9/7 - ( 2/7 10/21 )16.5/9 18 14 2/717. 4/5 25/16 + 2/3 3/418.14 8/7 5/6 12/1519.17/32 3/4 9/2420.3
17、2/9 + 1/321.5/7 3/25 + 3/722.3/14 2/3 + 1/623.1/5 2/3 + 5/624. 9/22 + 1/11 1/225. 5/3 11/5 + 4/326. 45 2/3 + 1/3 1527. 7/19 + 12/19 5/628. 1/4 + 3/4 2/329.8/7 21/16 + 1/230.101 1/5 1/5 2131.50 160 40 ( 58+370 )( 64-45 ) 18+3533.347+45 2-4160 5234 ( 58+37 )( 64-9 5 )35.95 (64-45 )5 6+42 420+580-6421
18、28(9+31 11 ) (136+64 )(65-34523 )38.85+14 (14+208 26 )39. ( 284+16 )( 512-8208 18 ) 4 18+3541. ( 58+37 )(64-9 5 ) 0.55) 43.0.12 4.8 0.12 44.( 3.2 1.5+2.5 )1.6 ( 2 ) 3.2 (1.5+2.5 )45.6-1.6 4= 5.38+7.85-5.37=46.7.2 0.8-1.2 5= 6-1.19 3-0.43=47.6.5 (4.8-1.2 4 ) = 0.68 1.9+0.32 48.10.15-10.75 49.5.8 (3.8
19、7-0.13 ) +4.2 50.32.52- ( 6+9.728 3.2 )51.-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)/101.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.(
20、x2+y2)2-4y(x2+y2)+4y2=(x2+y2-2y)23.(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)24.(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)26.3(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)