初一數(shù)學(xué)計(jì)算題及答案.doc

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初一數(shù)學(xué)計(jì)算題及答案 1.25×（8+10）? =1.25×8+1.25×10 =10+12.5=22.5? 9123-（123+8.8）? =9123-123-8.8 =9000-8.8 =8991.2? 1.24×8.3+8.3×1.76? =8.3×（1.24+1.76) =8.3×3=24.9? 9999×1001? =9999×（1000+1） =9999×1000+9999×1? =10008999? 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? =83? 1.24+0.78+8.76? =（1.24+8.76）+0.78? =10+0.78? =10.78? 933-157-43? =933-（157+43） =933-200 =733? 4821-998? =4821-1000+2 =3823? I32×125×25? =4×8×125×25? =（4×25）×（8×125） =100×1000? =100000 9048÷268? =（2600+2600+2600+1248）÷26 =2600÷26+2600÷26+2600÷26+1248÷269? =100+100+100+48 =348 2881÷ 43? =（1290+1591）÷ 434 =1290÷43+1591÷43 =30+37 3.2×42.3×3.75-12.5×0.423×16 =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×(4x0.4x7.5-1.25x4x0.4) =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+12-0.15 =13.8-0.15 =13.65 6.5×8+3.5×8-47? =52+28-47 =80-47 (80-9.8)×5分之2-1.32? =70.2X2/5-1.32 =28.08-1.32 =26.76 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? =21? 33.02－（148.4－90.85）÷2.5 =33.02－57.55÷2.5 =33.02－23.02? =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= 1.25? [-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+61? -2/9-7/9-56? 4.6-(-3/4+1.6-4-3/4)? 1/2+3+5/6-7/12? [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）〕÷15? 2160÷〔（83-79）×18〕 280＋840÷24×5? 325÷13×(266－250) 85×(95－1440÷24)? 58870÷(105＋20×2) 1437×27＋27×563? 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]÷2.5 81432÷(13×52＋78)? 5.4÷[2.6×（3.7-2.9）+0.62] （947－599）＋76×64 60－(9.5＋28.9)]÷0.18 2.881÷0.43－0.24×3.5 20×[(2.44－1.8)÷0.4＋0.15] 28-(3.4 1.25×2.4) 0.8×〔15.5-(3.21 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×[(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+35? （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+35 10.15-10.75×0.4-5.7? 5.8×（3.87-0.13）+4.2×3.74 347+45×2-4160÷52? 32.52-（6+9.728÷3.2）×2.5 87（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）+4.2×3.74? 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=1.02 6.4χ-χ=28+4.4? 11. 7 × 5/49 + 3/14? 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 × 12/15? 19. 17/32 – 3/4 × 9/24? 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 × 15? 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 × 21? 31.50＋160÷40 （58+370）÷（64-45）? 32.120-144÷18+35? 33.347+45×2-4160÷52? 34（58+37）÷（64-9×5）? 35.95÷（64-45）? 36.178-145÷5×6+42 420+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+35? 41.（58+37）÷（64-9×5）? 42.(6.8-6.8×0.55)÷8.5? 43.0.12× 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? 48.10.15-10.75×0.4-5.7? 49.5.8×（3.87-0.13）+4.2×3.74? 50.32.52-（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+ab(2a-b)? =a^3+2a^2b-2b^3-ab^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)-12? =a^2+3a+2+2a^2-3a-2-12? =3a^2-12? =3(a+2)(a-2)? 5.? x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2? =[x(y+z)-y(x-z)]^2? =(xz+yz)^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=1.02 6.4χ-χ=28+4.4? 11. 7 × 5/49 + 3/14? 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 × 12/15? 19. 17/32 – 3/4 × 9/24? 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 × 15? 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 × 21? 31.50＋160÷40 （58+370）÷（64-45）? 32.120-144÷18+35? 33.347+45×2-4160÷52? 34（58+37）÷（64-9×5）? 35.95÷（64-45）? 36.178-145÷5×6+42 420+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+35? 41.（58+37）÷（64-9×5）? 42.(6.8-6.8×0.55)÷8.5? 43.0.12× 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? 48.10.15-10.75×0.4-5.7? 49.5.8×（3.87-0.13）+4.2×3.74? 50.32.52-（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+ab(2a-b)? =a^3+2a^2b-2b^3-ab^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)-12? =a^2+3a+2+2a^2-3a-2-12? =3a^2-12? =3(a+2)(a-2)? 5.? x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2? =[x(y+z)-y(x-z)]^2? =(xz+yz)^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)