初一道数学计算题及答案完整版
初一道数学计算题及答
案
Document serial number【NL89WT-NY98YT-NC8CB-NNUUT-NUT108】
1.25×（8+10）=1.25×8+1.25×10 =10+1
2.5=22. 5 9123-（123+8.8）=9123-123-8.8 =9000-8.8 =8991. 2 1.24×8.3+8.3×1.7 6 =8.3×（1.24+1.76) =8.3×3=24.9 9999×100 1 =9999×（1000+1）=9999×1000+9999× 1
14.8×6.3-6.3×6.5＋8.3×3.7 =（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 =8 3 1.24+0.78+8.7 6 =（1.24+8.76）+0.78 =10+0.78 =10.78 933-157-4 3 =933-（157+43）=933-200 =73 3 4821-998 =4821-1000+ 2 =382 3 I32×125×2 5 =4×8×125×2 5 =（4×25）×（8×125）=100×1000 =100000 9048÷268 =（2600+2600+2600+1248）÷2 6 =2600÷26+2600÷26+2600÷26+1248÷269 =100+100+100+48 =348 2881÷4 3 =（1290+1591）÷43 4
=1290÷43+1591÷4 3 =30+37 3.2×42.3×3.75-12.5×0.423×1 6 =3.2×42.3×3.75-1.25×42.3×1. 6 =42.3×(3.2×3.75-1.25×1.6) =42.3×(4×0.8×3.75-1.25×4×0.4) =42.3×(4×0.4×2×3.75-1.25×4×0.4) =42.3×=42.3×[4×0.4×(7.5-1.25)] =42.3×[4×0.4×6.25] =42.3×(4×2.5) =4237 1.8+18÷1.5-0.5×0. 3 =1.8+12-0.1 5 =13.8-0.1 5 =13.6 5 6.5×8+3.5×8-47 =52+28-47 =80-47 (80-9.8)×5分之2-1.3 2 =70.2X2/5-1.3 2 =28.08-1.3 2 =26.7 6 8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25] =8×4/7÷ 4 =8/7 2700×（506－499）÷900 =2700×7÷900 =18900÷900 =2 1 33.02－（148.4－90.85）÷2. 5 =33.02－57.55÷2. 5 =33.02－23.0 2 =10 （1÷1－1）÷5. 1 =（1－1）÷5. 1 =0÷5. 1 =0 18.1＋（3－0.299÷0.23）× 1 =18.1＋1.7× 1 =18.1＋1.7 =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=1.2 5 [-26.54]+[-6.14]+18.54+6.14=-8 1.125+[-17/5]+[-1/8]+[-0.6]=- 3 [-98+76+(-87)]*23[56+(-75)-(7)]-(8+4+3) 5+21*8/2-6-59 68/21-8-11*8+6 1 -2/9-7/9-5 6 4.6-(-3/4+1.6-4-3/4) 1/2+3+5/6-7/1 2 [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*8/30/(-2)- 3 (-84)/2*(-3)/(-6) 1/2*(-4/15)/2/ 3 -3x+2y-5x-7y 1437×27＋27×563〔75-（12+18）〕÷1 5 2160÷〔（83-79）×18〕280＋840÷24× 5 325÷13×(266－250)85×(95－1440÷24) 58870÷(105＋20×2)1437×27＋27×56 3 81432÷(13×52＋78)[37.85-（7.85+6.4）]×30 156×[(17.7-7.2)÷3]（947－599）＋76×64 36×(913－276÷23)[192－（54＋38）]×67 [（7.1-5.6）×0.9-1.15]÷2.581432÷(13×52＋78) 5.4÷[2.6×（3.7-2.9）+0.62]（947－599）＋76×6460－(9.5＋28.9)]÷0.182.881÷0.43－0.24×3.520×[(2.44－1.8)÷0.4＋0.15]28-(3.41.25×2.4)0.8×〔15.5-(3.215.79)〕（31.83.2×4）÷5194－64.8÷1.8×0.936.72÷4.25×9.93.416÷（0.016×35）0.8×[(10－6.76)÷1.2] （136+64）×（65-345÷23）(6.8-6.8×0.55)÷8.5 0.12×4.8÷0.12×4.8（58+37）÷（64-9×5）812-700÷（9+31×11）（3.2×1.5+2.5）÷1.6 85+14×（14+208÷26）120-36×4÷18+3 5 （284+16）×（512-8208÷18）9.72×1.6-18.305÷7 4/7÷[1/3×（3/5-3/10）]（4/5+1/4）÷7/3+7/10 12.78－0÷（13.4＋156.6）37.812-700÷（9+31×11）（136+64）×（65-345÷23）3.2×（1.5+2.5）÷1. 6
85+14×（14+208÷26）（58+37）÷（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）÷1.6 120-36×4÷18+3510.15-10.75×0.4-5.7 5.8×（3.87-0.13）+4.2×3.74347+45×2-4160÷52 32.52-（6+9.728÷3.2）×2.587（58+37）÷（64-9×5）[（7.1-5.6）×0.9-1.15]÷2.5（3.2×1.5+2.5）÷1.6 5.4÷[2.6×（3.7-2.9）+0.62]12×6÷（12-7.2）-6 3.2×6+（1.5+2.5）÷1.6（3.2×1.5+2.5）÷1.6 5.8×（3.87-0.13）+4.2×3.7 4 33.02－（148.4－90.85）÷2. 5
1)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)
(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
1.3/7×49/9-4/ 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 0.12χ＋1.8×0.9=7.2(9－5χ)×0.3=1.026.4χ-χ=28+4.4
11.7×5/49+3/1 4
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
18.14×8/7–5/6×12/1 5
19.17/32–3/4×9/2 4
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+1/3×1 5
27.7/19+12/19×5/ 6
28.1/4+3/4÷2/ 3
29.8/7×21/16+1/ 2
30.101×1/5–1/5×2 1
31.50＋160÷40（58+370）÷（64-45）
32.120-144÷18+3 5
33.347+45×2-4160÷5 2 34（58+37）÷（64-9×5）
35.95÷（64-45）
36.178-145÷5×6+42420+580-64×21÷28
37.812-700÷（9+31×11）（136+64）×（65-345÷23）
38.85+14×（14+208÷26）
39.（284+16）×（512-8208÷18）
40.120-36×4÷18+3 5
41.（58+37）÷（64-9×5）
42.(6.8-6.8×0.55)÷8. 5 ×4.8÷0.12×4.8
44.（3.2×1.5+2.5）÷1.6（2）3.2×（1.5+2.5）÷1.6
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+0.32×1.9 ×0.4-5.7 49.5.8×（3.87-0.13）+4.2×3.7 4 （6+9.728÷3.2）×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+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10 1.
a^3-2b^3+a b(2a-b) =a^3+2a^2b-2b^3-a b^ 2 =a^2(a+2b)-b^2(2b+a) =(a+2b)(a^2-b^2) =(a+2b)(a+b)(a-b) 2. (x^2+y^2)^2-4y(x^2+y^2)+4y^ 2 =(x^2+y^2-2y)^ 2 3. (x^2+2x)^2+3(x^2+2x)+x^2+2x+ 3 =(x^2+2x)^2+4(x^2+2x)+ 3 =(x^2+2x+3)(x^2+2x+1) =(x^2+2x+3)(x+1)^ 2 4. (a+1)(a+2)+(2a+1)(a-2)-1 2 =a^2+3a+2+2a^2-3a-2-1 2 =3a^2-1 2 =3(a+2)(a-2) 5. x^2(y+z)^2-2x y(x-z)(y+z)+y^2(x-z)^ 2 =[x(y+z)-y(x-z)]^ 2 =(x z+y z)^ 2 =z^2(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+a^2-c^ 2 =(a+b)^2-c^2+a^2-(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)(x^2+x-1)- 2 =(x^2+x)(x^2+x-1)- 2 =(x^2+x)^2-(x^2+x)- 2 =(x^2+x-2)(x^2+x+1) =(x+2)(x-1)(x^2+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 0.12χ＋1.8×0.9=7.2(9－5χ)×0.3=1.026.4χ-χ=28+4.4
11.7×5/49+3/1 4
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
18.14×8/7–5/6×12/1 5
19.17/32–3/4×9/2 4
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+1/3×1 5
27.7/19+12/19×5/ 6
28.1/4+3/4÷2/ 3
29.8/7×21/16+1/ 2
30.101×1/5–1/5×2 1
31.50＋160÷40（58+370）÷（64-45）
32.120-144÷18+3 5
33.347+45×2-4160÷5 2 34（58+37）÷（64-9×5）
35.95÷（64-45）
36.178-145÷5×6+42420+580-64×21÷28
37.812-700÷（9+31×11）（136+64）×（65-345÷23）
38.85+14×（14+208÷26）
39.（284+16）×（512-8208÷18）
40.120-36×4÷18+3 5
41.（58+37）÷（64-9×5）
42.(6.8-6.8×0.55)÷8. 5 ×4.8÷0.12×4.8
44.（3.2×1.5+2.5）÷1.6（2）3.2×（1.5+2.5）÷1.6
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+0.32×1.9 ×0.4-5.7
49.5.8×（3.87-0.13）+4.2×3.7 4 （6+9.728÷3.2）×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+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10 1. a^3-2b^3+a b(2a-b) =a^3+2a^2b-2b^3-a b^ 2 =a^2(a+2b)-b^2(2b+a) =(a+2b)(a^2-b^2) =(a+2b)(a+b)(a-b) 2. (x^2+y^2)^2-4y(x^2+y^2)+4y^ 2 =(x^2+y^2-2y)^ 2 3. (x^2+2x)^2+3(x^2+2x)+x^2+2x+ 3 =(x^2+2x)^2+4(x^2+2x)+ 3 =(x^2+2x+3)(x^2+2x+1) =(x^2+2x+3)(x+1)^ 2 4. (a+1)(a+2)+(2a+1)(a-2)-1 2 =a^2+3a+2+2a^2-3a-2-1 2 =3a^2-1 2 =3(a+2)(a-2) 5. x^2(y+z)^2-2x y(x-z)(y+z)+y^2(x-z)^ 2 =[x(y+z)-y(x-z)]^ 2 =(x z+y z)^ 2 =z^2(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+a^2-c^ 2 =(a+b)^2-c^2+a^2-(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)(x^2+x-1)- 2 =(x^2+x)(x^2+x-1)- 2 =(x^2+x)^2-(x^2+x)- 2 =(x^2+x-2)(x^2+x+1) =(x+2)(x-1)(x^2+x+1)