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已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 快救救我~~~~
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x/y=2
x=2y
[2x(x+y)-y(x+y)=/(4x²-4xy+y² )
=(x+y)(2x-y)/(2x-y)²
=(x+y)(2x-y)
=(2y+y)/(4y-y)
=1
x=2y
[2x(x+y)-y(x+y)=/(4x²-4xy+y² )
=(x+y)(2x-y)/(2x-y)²
=(x+y)(2x-y)
=(2y+y)/(4y-y)
=1
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