4(x-y-1)=3(1-y)-2 2/x+3/y=2用带入发解,标准过程

来源：百度知道编辑：UC知道时间：2024/06/18 06:56:04

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4(x-y-1)=3(1-y)-2 ........(1)
2/x+3/y=2.................(2)
由(1)得,
4x-4y-4=3-3y-2
4x-y-5=0
y=4x-5
把y=4x-5代入(2)中
2/x+3/(4x-5)=2
2(4x-5)+3x=2x(4x-5)
8x-10+3x=8x^2-10x
8x^2-21x+10=0
(x-2)(8x-5)=0
x=2或x=5/8
y=4x-5=3或y=4x-5=-5/2
所以有两组解x=2,y=3
或x=5/8,y=-5/2

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