初一100道数学计算题及解答
千奇百怪-卖房协议
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
=70.2X25-1.32
=28.08-1.32
=26.76
8×7分之4÷[1÷(3.2-2.95)]
=8×47÷[1÷0.25]
=8×47÷4
=87
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]+[-12]+34+[-14]= -1
[-72]+56+[-0.5]+45+196= 1.25
[-26.54]+[-6.14]+18.54+6.14= -8
1.125+[-175]+[-18]+[-0.6]= -3
[-98+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
5+21*82-6-59
6821-8-11*8+61
-29-79-56
4.6-(-34+1.6-4-34)
12+3+56-712
[23-4-14*(-0.4)]13+2
22+(-4)+(-2)+4*3
-2*8-8*12+818
(23+12)(-112)*(-12)
(-28)(-6+4)+(-1)
2(-2)+07-(-8)*(-2)
(14-56+13+23)12
18-6(-3)*(-2)
(5+38*830(-2)-3
(-84)2*(-3)(-6)
12*(-415)23
-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
47÷[13×(35-310)]
(45+14)÷73+710
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)(-73)+(-76)
(6)94+(-32)
(7)3.75+(2.25)+54
(8)-3.75+(+54)+(-1.5)
(9)(-174)+(-103)+(+133)+(113)
(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(11)(+1.3)-(+177)
(12)(-2)-(+23)
(13)|(-7.2)-(-6.3)+(1.1)|
(14)|(-54)-(-34)|-|1-54-|-34|)
(15)(-2199)*(-76-32+83)
(16)4a)*(-3b)*(5c)*16
1. 37 × 499 - 43
2. 89 × 1536 + 127
3. 12× 56 – 29 ×3
4. 8× 54 + 14
5. 6÷ 38 – 38 ÷6
6. 47
× 59 + 37 × 59
7. 52 -( 32 + 45 )
8. 78
+ ( 18 + 19 )
9. 9 × 56 + 56
10. 34 × 89
- 13
0.12χ+1.8×0.9=7.2 (9-5χ)×0.3=1.02
6.4χ-χ=28+4.4
11. 7 × 549 + 314
12. 6 ×(
12 + 23 )
13. 8 × 45 + 8 × 115
14. 31 ×
56 – 56
15. 97 - ( 27 – 1021 )
16. 59 ×
18 – 14 × 27
17. 45 × 2516 + 23 × 34
18.
14 × 87 – 56 × 1215
19. 1732 – 34
× 924
20. 3 × 29 + 13
21. 57 × 325 + 37
22. 314 ×× 23 + 16
23. 15 × 23 + 56
24. 922 + 111 ÷ 12
25. 53 × 115 + 43
26. 45 × 23 + 13 × 15
27. 719 + 1219 × 56
28. 14 + 34 ÷ 23
29. 87 × 2116 + 12
30. 101 × 15 – 15 × 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(13)+79(3+64)
54.123+456+789+98(-4)
55.36933-(-54-3115.5)
56.39+{3x[422x(3x8)]}
57.9x8x75x(4+6)
58.11x22(4+122)
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. 37 × 499 - 43
2. 89 × 1536 + 127
3. 12× 56 – 29 ×3
4. 8× 54 + 14
5.
6÷ 38 – 38 ÷6
6. 47 × 59 + 37 × 59
7. 52
-( 32 + 45 )
8. 78 + ( 18 + 19 )
9. 9 × 56 + 56
10. 34 × 89 - 13
0.12χ+1.8×0.9=7.2 (9-5χ)×0.3=1.02
6.4χ-χ=28+4.4
11. 7 × 549 + 314
12. 6 ×(
12 + 23 )
13. 8 × 45 + 8 × 115
14. 31 ×
56 – 56
15. 97 - ( 27 – 1021 )
16. 59 ×
18 – 14 × 27
17. 45 × 2516 + 23 × 34
18.
14 × 87 – 56 × 1215
19. 1732 – 34 × 924
20. 3 × 29 + 13
21. 57 × 325 + 37
22. 314 ×× 23 + 16
23. 15 × 23 + 56
24. 922 + 111 ÷ 12
25. 53 × 115 + 43
26. 45 × 23 + 13 × 15
27. 719 + 1219 × 56
28. 14 + 34 ÷ 23
29. 87 × 2116 + 12
30. 101 × 15 – 15 × 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(13)+79(3+64)
54.123+456+789+98(-4)
55.36933-(-54-3115.5)
56.39+{3x[422x(3x8)]}
57.9x8x75x(4+6)
58.11x22(4+122)
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)