解方程 (1)20.52x-(1-0.52)x=80 (2)43x+7=32-2x (3)2(7x-5)=3(4) 53x+5(138-x)=540(5)63x-7(x-1)=3-2(x+30(6)18x+3x-3=18-2(2x-1)(7)3(20-y)=6y-4(y-11)(8)4(2x-1)=3(5x+1)

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解方程 (1)20.52x-(1-0.52)x=80 (2)43x+7=32-2x (3)2(7x-5)=3(4) 53x+5(138-x)=540(5)63x-7(x-1)=3-2(x+30(6)18x+3x-3=18-2(2x-1)(7)3(20-y)=6y-4(y-11)(8)4(2x-1)=3(5x+1)
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解方程 (1)20.52x-(1-0.52)x=80 (2)43x+7=32-2x (3)2(7x-5)=3(4) 53x+5(138-x)=540(5)63x-7(x-1)=3-2(x+30(6)18x+3x-3=18-2(2x-1)(7)3(20-y)=6y-4(y-11)(8)4(2x-1)=3(5x+1)
解方程 (1)20.52x-(1-0.52)x=80 (2)43x+7=32-2x (3)2(7x-5)=3
(4) 53x+5(138-x)=540
(5)63x-7(x-1)=3-2(x+30
(6)18x+3x-3=18-2(2x-1)
(7)3(20-y)=6y-4(y-11)
(8)4(2x-1)=3(5x+1)

解方程 (1)20.52x-(1-0.52)x=80 (2)43x+7=32-2x (3)2(7x-5)=3(4) 53x+5(138-x)=540(5)63x-7(x-1)=3-2(x+30(6)18x+3x-3=18-2(2x-1)(7)3(20-y)=6y-4(y-11)(8)4(2x-1)=3(5x+1)
(1)20.52x-(1-0.52)x=80
20.52x-0.48x=80
20.04x=80
x=2000/501
(2)43x+7=32-2x
43x+2x=32-7
45x=25
x=5/9
(3)2(7x-5)=3
7x-5=1.5
7x=6.5
x=13/14

合并同类项,方程1:x(20.52-1+0.52)=80 x=80/20.04
方程2:移向,43x+2x=32-7 x=25/45=5/9
方程3:展开:14x-10=3,移向:14x=13,x=13/14

(1)20.52x-(1-0.52)x=80
20.52x-0.48x=80
20.04x=80
x=2000/501
(2)43x+7=32-2x
45x=25
x=25/45
...

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(1)20.52x-(1-0.52)x=80
20.52x-0.48x=80
20.04x=80
x=2000/501
(2)43x+7=32-2x
45x=25
x=25/45
x=5/9
(3)2(7x-5)=3
14x-10=6
14x=16
x=8/7

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