七年级解方程计算题专项练习.docx精品文档
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解 方 程 :
(1)
x
2
x1
(2)4x
1
x34
5
2
2
3
(3)
4
12
()
1
x
x
5
5
(5)7x
6226x;
(6)4x3
5x
2;
(7)4x
53x;
(8)3y7
3y5
(1)2(x-1)+4=0
(2)4-(3-x)=-2
(3)(x+1)-2(x-1)=1-3x
(4)2(x-2)-6(x-1)=3
(1-x)
(5)4(x-1)-10(1-2x)=-3(2x+1)
(6)2
(x+3)-5(1-x)=3(x-1)
(7)3
(x+1)-2(x+2)=2x+3
(8)2(x-1)-(x-3)=2(-)
(9)3(x-7)-2[9-4(2-x)]=22
(10)3x-2[3(x-1)-2(x+2)]=3(18-x)
(11)
3
2
1
x
1
2
21
2
x
(12)
3
4x
1
2
2x
2
3
4
2
3
2
3
3
(1)
x=3x-1
(2)x
x
1
1
2
2
5
(5)
x
1
x
2
4x
(6)1[x
1(x1)]
2(x1)
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2
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3
6
2
2
2
3
(7)
x
2
x
1
3
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