初一数学计算题及答案.docx
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初一数学计算题及答案.docx
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初一数学计算题及答案
初一数学计算题及答案)×(1.258+10108+1.25×=1.25×=10+12.5=22.5
)9123-(123+8.8=9123-123-8.8
=9000-8.8
=8991.2×1.76×1.248.3+8.31.24+1.76)=8.3×(×=8.33=24.9
×10019999)×(1000+1=99991×=9999×1000+9999=10008999
×+8.33.7×14.8×6.3-6.36.53.7×+8.3)×=(14.8-6.56.33.7×=8.36.3+8.3×)×(8.36.3+3.7
×10=8.3=831.24+0.78+8.76.
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
)=933-(157+43=933-200
=7334821-998=4821-1000+2
=3823
25125I32××25×8×125×=48×125)25=(4×)×(×1000=100=100000
÷268904826
2600+2600+2600+1248()÷=26926+2600÷26+2600÷÷26+1248÷=2600=100+100+100+48
=348
÷432881434
)÷1290+1591(=
4343+1591÷÷=1290=30+37
160.423×42.33.2××3.75-12.5×1.6×3.75-1.25=3.2×42.3××42.31.6)×=42.3×(3.2×3.75-1.250.4)0.8×4×3.75-1.25×(4=42.3××0.4)×4×2(4=42.3××0.4××3.75-1.25(4x0.4x7.5-1.25x4x0.4)=42.3×(7.5-1.25)]×0.4=42.3×[4×0.4=42.3×[4××6.25]
2.5)=42.3××(4=42370.3×1.8+18÷1.5-0.5=1.8+12-0.15
=13.8-0.15
=13.65
×8+3.5×8-476.5=52+28-47
=80-47
2-1.325(80-9.8)×分之
=70.2X2/5-1.32
=28.08-1.32
=26.76
(3.2-2.95)]4÷÷[18×7分之0.25][1÷÷=8×4/74÷×4/7=8=8/7
900-2700×(506499)÷900×=27007÷÷=18900900=21
2.5)÷-33.02-(148.490.852.5÷=33.02-57.55-=33.0223.02=10
-1)÷5.11(÷1)÷5.11=(-15.1=0÷=0
1)×0.29918.1+(3-÷0.231.7+×1=18.11.7=18.1+=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÷245
÷325÷13×(266-250)85×(95-144024)
×58870÷(105+20×2)1437×27+27563
×81432÷(13×52+78)[37.85-(7.85+6.4)]30
×156×[(17.7-7.2)÷3](947-599)+7664
)36×(913-276÷23)[192-(54+38]×67
×[(7.1-5.6)×0.9-1.15]÷2.581432÷(1352+78)
28.9)]947+0.62](-599)+76×6460-(9.5+÷5.4[2.6×(3.7-2.9)28-(3.4×3.520×[(2.44-1.8)÷0.4+0.15]÷÷0.182.8810.43-0.24÷〕(31.83.2×4)÷5194-64.81.25×2.4)0.8×〔15.5-(3.215.79)÷35)6.76)[(10-0.8××1.8×0.936.72÷4.259.93.416÷(0.016×1.2]
(6.8-6.8×0.55)÷8.5÷(136+64)×(65-34523))÷(64-9×5)÷0.12×4.80.12×4.8(58+37×1.5+2.5)÷1.69+31812-700÷(×11)(3.24÷18+3514+20885+14×(÷26)120-36×7÷18)9.72×1.6-18.305512-8208(284+16)×(÷7/3+7/10](4/5+1/4)÷×(4/7÷[1/33/5-3/10))136+64()11×9+31(÷37.812-700)156.6+13.4(÷0-12.78.
)÷1.61.5+2.5×(65-345÷23)3.2×()64-914+20885+14×(÷26)(58+37)÷(×5÷×(6.8-6.80.55)÷8.5(284+16)×(512-820818)×0.12×4.8÷0.12×4.8(3.21.5+2.5)÷1.6
×120-364÷18+3510.15-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74347+45÷52×2-416032.52-64-9×5))÷((6+9.728÷3.2)×2.587(58+37)÷1.63.2)×0.9-1.15]÷2.5(×1.5+2.5[(7.1-5.6-66×÷(12-7.2)3.7-2.95.4÷[2.6×()+0.62]121.6)÷3.21.5+2.53.2×6+()÷1.6(×1.5+2.5+4.25.8×(3.87-0.13)×3.742.5148.433.02-(-90.85)÷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
×49/9-4/31.3/7
×15/36+1/272.8/9
×3–3.12×5/62/9
5/4+1/44.8×68÷5.63/8–3/÷5/96.4/7×5/9+3/7×
)7.5/2-(3/2+4/5
)8.7/8+(1/8+1/9
5/6+5/69.9×
8/9-1/3×10.3/4
0.3=1.026.4χ)×χ-χ=28+4.451.80.12χ+×0.9=7.2(9-11.7×5/49+3/14×(12.61/2+2/3)4/5+8×11/5×13.8
655/6–/×14.31
)2110/–/72(15.9/7-
×2/71816.5/9×–14
×3/417.4/5×25/16+2/3
12/15–18.14×8/75/6×9/24419.17/32–3/×
2/9+1/3×20.3
3/25+3/721.5/7×2/3+1/622.3/14××2/3+5/623.1/5×1/224.9/22+1/11÷11/5+4/325.5/3×1526.45×2/3+1/3×5/627.7/19+12/19×2/328.1/4+3/4÷21/16+1/229.8/7×21/30.101×1/5–15×
64-4531.50+160÷40(58+370)÷()18+3532.120-144÷5233.347+45×2-4160÷×58+37)÷(64-95)(3464-4535.95÷()21÷28×36.178-145÷56+42420+580-64×)23÷65-345)×(136+64()11×9+31÷(37.812-700.
÷26)38.85+14×(14+208)18284+1639.()×(512-8208÷18+35÷40.120-36×4))÷(58+3764-9×541.(8.542.(6.8-6.8×0.55)÷÷0.12×4.843.0.12×4.81.6)÷1.6
(2)3.2×(1.5+2.5)÷(44.3.2×1.5+2.54=5.38+7.85-5.37=45.6-1.6÷×46.7.2÷0.8-1.2×5=6-1.193-0.43=1.9+0.32×1.9××47.6.5×(4.8-1.24)=0.6848.10.15-10.75×0.4-5.73.74)49.5.8×(3.87-0.13+4.2×)×(50.32.52-6+9.728÷3.22.5
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)^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+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)
×1.3/749/9-4/3
×15/36+1/272.8/9
/9×3265×3.12/–5/4+1/4×4.8.
8÷635.6÷/8–3/5/9×6.4/7×5/9+3/7
3/2+4/5)7.5/2-(1/8+1/9)8.7/8+(×5/6+5/69.9
8/9-1/3×10.3/4
=28+4.4-0.9=7.2(90.12χ+1.8×-5χ)×0.3=1.026.4χχ5/49+3/1411.7×)1/2+2/312.6×(
11/54/5+813.8××
6×14.315/6–5//715.9/7-(2–10/21)2/716.5/9×18–14×
×17.4/5×25/16+2/33/4
8/7–5/6×12/1518.14×9/244×//19.1732–3×2/9+1/320.3
3/25+3/7×21.5/7
2/3+1/622.3/14××2/3+5/623.1/5×
÷1/224.9/22+1/11
11/5+4/3×25.5/3
152/3+1/3××26.45
5/627.7/19+12/19×
2/328.1/4+3/4÷
29.8/7×21/16+1/2
/521×30.101×1/5–1)58+370)÷(64-4516031.50+÷40(32.120-144÷18+35
×2-4160÷5233.347+4564-9×5)34(58+37)÷(35.95÷(64-45)
21÷28×36.178-145÷5×6+42420+580-6423))×(÷(37.812-7009+31×11)(136+6465-345÷26)38.85+14×(14+208÷18)39.(284+16)×(512-8208÷÷18+3540.120-36×4)64-941.(58+37)÷(×58.5×42.(6.8-6.80.55)÷4.8×43.0.124.8÷0.12×1.6×(1.5+2.5)÷3.21.63.244.(×1.5+2.5)÷
(2)45.6-1.6÷4=5.38+7.85-5.37=3-0.43=×0.8-1.246.7.2÷×5=6-1.191.9×1.9+0.32×=0.68)4×4.8-1.2×(47.6.5.
48.10.15-10.75×0.4-5.7
3.74)49.5.8×(3.87-0.13+4.2×)×(50.32.52-6+9.728÷3.22.5
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)^23.
(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)
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