x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
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x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
(x+3y)(x-2y)=0
x=-3y (舍去) x=2y
∴(x+3y)/(x-y)
=5y/(2y-y)
=5