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
1.25X(8+10)=1.25X8+1.25X10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24X8.3+8.3X1.76
=8.3X(1.24+1.76)
=8.3X3=24.9
9999X1001
=9999X(1000+1)
=9999X1000+9999X1
=10008999
14.8X6.3-6.3X6.5+8.3X3.7=(14.8-6.5)X6.3+8.3X3.7=8.3X6.3+8.3X3.7
8.3X(6.3+3.7)
=8.3X10
=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
I32X125X25
=4X8X125X25
=(4X25)X(8X125)
=100X1000
=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+1591十43
=30+37
3.2X42.3X3.75-12.5X0.423X16
=3.2X42.3X3.75-1.25X42.3X1.6
=42.3X(3.2X3.75-1.25X1.6)
=42.3X(4X0.8X3.75-1.25X4X0.4)
=42.3X(4X0.4X2X3.75-1.25X4X0.4)
=42.3X(4x0.4x7.5-1.25x4x0.4)
=42.3X[4X0.4X(7.5-1.25)]
=42.3X[4X0.4X6.25]
=42.3X(4X2.5)
=4237
1.8+18-1.5-0.5X0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5X8+3.5X8-47
=52+28-47
=80-47
(80-9.8)X5分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8X7分之4-[1-(3.2-2.95)]
=8X4/7-[1-0.25]
=8X4/7-4
=8/7
2700X(506-499)-900
=2700X7-900
=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)X1
=18.1+1.7X1
=18.1+1.7
=19.8
卜18]+29+卜52]+60=19
[-3]+[-2]+[-1]+0+1+2二-3
卜301]+125+301+卜75]=50
[-1]+[-1/2]+3/4+[-1/4]=-1
[-7/2]+5/6+[-0.5]+4/5+19/6二1.25
[-26.54]+[-6.14]+18.54+6.14二-8
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
1437X27+27X563〔75-(12+18)〕-15
2160-〔(83-79)X18〕280+840-24X5
325-13X(266—250)85X(95—1440-24)
58870-(105+20X2)1437X27+27X563
81432-(13X52+78)[37.85-(7.85+6.4)]X30
156X[(17.7-7.2)-3](947—599)+76X64
36X(913—276-23)[192—(54+38)]X67
[(7.1-5.6)X0.9-1.15]-2.581432-(13X52+78)
5.4-[2.6X(3.7-2.9)+0.62](947—599)+76X6460—(9.5+28.9)]
-0.182.881-0.43—0.24X3.520X[(2.44—1.8)-0.4+0.15]
28-(3.41.25X2.4)0.8X〔15.5-(3.215.79)〕(31.83.2X4)
5194—64.8-1.8X0.936.72-4.25X9.93.416-(0.016X35)0.8
X[(10—6.76)-1.2]
(136+64)X(65-345-23)(6.8-6.8X0.55)-8.5
0.12X4.8-0.12X4.8(58+37)-(64-9X5)
812-700-(9+31X11)(3.2X1.5+2.5)-1.6
85+14X(14+208-26)120-36X4-18+35
(284+16)X(512-8208-18)9.72X1.6-18.305-7
4/7-[1/3X(3/5-3/10)](4/5+1/4)-7/3+7/10
12.78—0-(13.4+156.6)37.812-700-(9+31X11)(136+64)
X(65-345-23)3.2X(1.5+2.5)-1.6
85+14X(14+208-26)(58+37)十(64-9X5)
(6.8-6.8X0.55)-8.5(284+16)X(512-8208-18)
0.12X4.8-0.12X4.8(3.2X1.5+2.5)-1.6
120-36X4-18+3510.15-10.75X0.4-5.7
5.8X(3.87-0.13)+4.2X3.74347+45X2-4160-52
32.52-(6+9.728-3.2)X2.587(58+37)-(64-9X5)[(7.1-5.6)X0.9-1.15]-2.5(3.2X1.5+2.5)-1.6
5.4-[2.6X(3.7-2.9)+0.62]12X6-(12-7.2)-6
3.2X6+(1.5+2.5)-1.6(3.2X1.5+2.5)-1.6
5.8X(3.87-0.13)+4.2X3.74
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)卜|1-5/4-卜3/4|)
(15)(-2/199)*(-7/6-3/2+8/3)
(16)4a)*(-3b)*(5c)*1/6
1.3/7X49/9-4/3
2.8/9X15/36+1/27
3.12X5/6-2/9X3
4.8X5/4+1/4
5.6-3/8—3/8-6
6.4/7X5/9+3/7X5/9
7.5/2-(3/2+4/5)
8.7/8+(1/8+1/9)
9.9X5/6+5/6
10.3/4X8/9-1/3
0.12x+1.8X0.9=7.2(9—5x)X0.3=1.026.4x-X=28+4.4
11.7X5/49+3/14
12.6X(1/2+2/3)
13.8X4/5+8X11/5
14.31X5/6—5/6
15.9/7-(2/7—10/21)
16.5/9X18—14X2/7
17.4/5X25/16+2/3X3/4
18.14X8/7-5/6X12/15
19.仃/32-3/4X9/24
20.3X2/9+1/3
21.5/7X3/25+3/7
22.3/14XX2/3+1/6
23.1/5X2/3+5/6
24.9/22+1/11-1/2
25.5/3X11/5+4/3
26.45X2/3+1/3X15
27.7/19+12/19X5/6
28.1/4+3/4-2/3
29.8/7X21/16+1/2
30.101X1/5-1/5X21
31.50+160-40(58+370)十(64-45)
32.120-144-18+35
33.347+45X2-4160-52
34(58+37)-(64-9X5)
35.95-(64-45)
36.178-145-5X6+42420+580-64X21-28
37.812-700-(9+31X11)(136+64)X(65-345-23)
38.85+14X(14+208十26)
39.(284+16)X(512-8208-18)
40.120-36X4-18+35
41.(58+37)-(64-9X5)
42.(6.8-6.8X0.55)-8.5
43.0.12X4.8-0.12X4.8
44.(3.2X1.5+2.5)-1.6
(2)3.2X(1.5+2.5)-1.6
45.6-1.6-4=5.38+7.85-5.37=
46.7.2-0.8-1.2X5=6-1.19X3-0.43=
47.6.5X(4.8-1.2X4)=0.68X1.9+0.32X1.9
48.10.15-10.75X0.4-5.7
49.5.8X(3.87-0.13)+4.2X3.74
50.32.52-(6+9.728-3.2)X2.5
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.
aA3-2bA3+ab(2a-b)
=aA3+2aA2b-2bA3-abA2
二aA2(a+2b)-bA2(2b+a)
=(a+2b)(aA2-bA2)
=(a+2b)(a+b)(a-b)
2.
&八2+丫八2)八2-4丫&八2+丫八2)+4丫八2
=&八2+丫八2-2丫)八2
3.
(xA2+2x)A2+3(xA2+2x)+xA2+2x+3
=(xA2+2x)A2+4(xA2+2x)+3
=(xA2+2x+3)(xA2+2x+1)
=(xA2+2x+3)(x+1)A2
4.
(a+1)(a+2)+(2a+1)(a-2)-12
=aA2+3a+2+2aA2-3a-2-12
=3aA2-12
=3(a+2)(a-2)
5.
xA2(y+z)A2-2xy(x-z)(y+z)+yA2(x-z)A2
二[x(y+z)-y(x-z)F2
=(xz+yz)八2
=zA2(x+y)A2
6.
3(a+2)A2+28(a+2)-20
二[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)
7.
(a+b)A2-(b-c)A2+aA2-cA2
=(a+b)A2-cA2+aA2-(b-c)A2
=(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)(xA2+x-1)-2
=(xA2+x)(xA2+x-1)-2
=(xA2+x)A2-(xA2+x)-2
=(xA2+x-2)(xA2+x+1)
=(x+2)(x-1)(xA2+x+1)
1.3/7X49/9-4/3
2.8/9X15/36+1/27
3.12X5/6-2/9X3
4.8X5/4+1/4
5.6-3/8—3/8-6
6.4/7X5/9+3/7X5/9
7.5/2-
(3/2+4/5)
8.7/8+
(1/8+1/9)
9.9X5/6+5/6
10.3/4
X8/9-1/3
0.12x+1.8X0.9=7.2(9—5x)X0.3=1.026.4x-X=28+4.4
11.7X
5/49+3/14
12.6X
(1/2+2/3)
13.8X
4/5+8X11/5
14.31X5/6—5/6
15.9/7-
(2/7—10/21)
16.5/9
X18-14X2/7
17.4/5
X25/16+2/3X3/4
18.14X8/7-5/6X12/15
19.17/32
—3/4X9/24
20.3X
2/9+1/3
21.5/7
X3/25+3/7
22.3/14
XX2/3+1/6
23.1/5
X2/3+5/6
24.9/22+1/11-1/2
25.5/3X11/5+4/3
26.45X2/3+1/3X15
27.7/19+12/19X5/6
28.1/4+3/4-2/3
29.8/7X21/16+1/2
30.101X1/5-1/5X21
31.50+160-40(58+370)十(64-45)
32.120-144-18+35
33.347+45X2-4160-52
34(58+37)-(64-9X5)
35.95-(64-45)
36.178-145-5X6+42420+580-64X21-28
37.812-700-(9+31X11)(136+64)X(65-345-23)
38.85+14X(14+208-26)
39.(284+16)X(512-8208-18)
40.120-36X4-18+35
41.(58+37)-(64-9X5)
42.(6.8-6.8X0.55)-8.5
43.0.12X4.8-0.12X4.8
44.(3.2X1.5+2.5)-1.6
(2)3.2X(1.5+2.5)-1.6
45.6-1.6-4=5.38+7.85-5.37=
46.7.2-0.8-1.2X5=6-1.19X3-0.43=
47.6.5X(4.8-1.2X4)=0.68X1.9+0.32X1.9
48.10.15-10.75X0.4-5.7
49.5.8X(3.87-0.13)+4.2X3.74
50.32.52-(6+9.728-3.2)X2.5
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.
aA3-2bA3+ab(2a-b)
=aA3+2aA2b-2bA3-abA2
=aA2(a+2b)-bA2(2b+a)
=(a+2b)(aA2-bA2)
=(a+2b)(a+b)(a-b)
2.
&八2+丫八2)八2-4丫&八2+丫八2)+4丫八2
=&八2+丫八2-2丫)八2
(xA2+2x)A2+3(xA2+2x)+xA2+2x+3
=(xA2+2x)A2+4(xA2+2x)+3
=(xA2+2x+3)(xA2+2x+1)
=(xA2+2x+3)(x+1)A2
4.
(a+1)(a+2)+(2a+1)(a-2)-12
=aA2+3a+2+2aA2-3a-2-12
=3aA2-12
=3(a+2)(a-2)
5.
xA2(y+z)A2-2xy(x-z)(y+z)+yA2(x-z)A2
=[x(y+z)-y(x-z)]A2
=(xz+yz)A2
=zA2(x+y)A2
6.
3(a+2)A2+28(a+2)-20
二[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)
7.
(a+b)A2-(b-c)A2+aA2-cA2
=(a+b)A2-cA2+aA2-(b-c)A2
=(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)(xA2+x-1)-2
=(xA2+x)(xA2+x-1)-2
=(xA2+x)A2-(xA2+x)-2
=(xA2+x-2)(xA2+x+1)
=(x+2)(x-1)(xA2+x+1)
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