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
×(8+10)
=×8+×10
=10+=
9123-(123+)
=
=
=
×+×
=×(+
=×3=
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=
×
=()×+×
=×+×
×(+)
=×10
=83
++
=(+)+
=10+
=
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
××
=××
=××
=×(4××
=×(4××2×
=×
=×[4××
=×[4××]
=×(4×
=4237
+18÷
=+
=
=
×8+×8-47
=52+28-47
=80-47
×5分之
=
=
=
8×7分之4÷[1÷
=8×4/7÷[1÷]
=8×4/7÷4
=8/7
2700×(506-499)÷900
=2700×7÷900
=18900÷900
=21
-(-)÷
=-÷
=-
=10
(1÷1-1)÷
=(1-1)÷
=0÷
=0
+(3-÷)×1
=+×1
=+
=
[-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+[]+4/5+19/6=
[]+[]++=-8
+[-17/5]+[-1/8]+[]=-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
(-3/4+4)
1/2+3+5/6-7/12
[2/3-4-1/4*]/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)[(+)]×30
156×[(947-599)+76×64
36×(913-276÷23)[192-(54+38)]×67
[()×81432÷(13×52+78)
÷[×()+](947-599)+76×6460-+]÷÷-×20×[-÷+]28-××〔〕(×4)÷5194-÷×÷×÷(×35)×[(10-÷]
(136+64)×(65-345÷23)
×÷×(58+37)÷(64-9×5)
812-700÷(9+31×11)(×+)÷
85+14×(14+208÷26)120-36×4÷18+35
(284+16)×(512-8208÷18)×
4/7÷[1/3×(3/5-3/10)](4/5+1/4)÷7/3+7/10
-0÷(+)÷(9+31×11)(136+64)×(65-345÷23)×(+)÷
85+14×(14+208÷26)(58+37)÷(64-9×5)
(284+16)×(512-8208÷18)
×÷×(×+)÷
120-36×4÷18+35
×()+×347+45×2-4160÷52
(6+÷)×87(58+37)÷(64-9×5)
[()×÷(×+)÷
÷[×()+]12×6÷()-6
×6+(+)÷(×+)÷
×()+×
-(-)÷
1)23+(-73)
(2)(-84)+(-49)
(3)7+
(4)+
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)++5/4
(8)+(+5/4)+
(9)(-17/4)+(-10/3)+(+13/3)+(11/3)
(10)+(++++(++(+
(11)(+-(+17/7)
(12)(-2)-(+2/3)
(13)|-+|
(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
χ+×=(9-5χ)×=χ-χ=28+
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
+160÷40(58+370)÷(64-45)
÷18+35
+45×2-4160÷52
34(58+37)÷(64-9×5)
÷(64-45)
÷5×6+42420+580-64×21÷28
÷(9+31×11)(136+64)×(65-345÷23)
+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
×4÷18+35
41.(58+37)÷(64-9×5)
42.
÷×
44.(×+)÷
(2)×(+)÷
+
×=
()=×+×
()+×
(6+÷)×
+58+13+90+78-(-56)+50
*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4)
+456+789+98/(-4)
33-(-54-31/
+{3x[42/2x(3x8)]}
5x(4+6)
(4+12/2)
+(-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
χ+×=(9-5χ)×=χ-χ=28+
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
+160÷40(58+370)÷(64-45)
÷18+35
+45×2-4160÷52
34(58+37)÷(64-9×5)
÷(64-45)
÷5×6+42420+580-64×21÷28
÷(9+31×11)(136+64)×(65-345÷23)
+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
×4÷18+35
41.(58+37)÷(64-9×5)
42.
÷×
44.(×+)÷
(2)×(+)÷
+
×=
()=×+×
()+×
(6+÷)×
+58+13+90+78-(-56)+50
*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4)
+456+789+98/(-4)
33-(-54-31/
+{3x[42/2x(3x8)]}
5x(4+6)
(4+12/2)
+(-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)