初一100道数学计算题及答案解析

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

=10.78

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

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 3

6.72÷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）