已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值在练习册用配方法解一元二次方程那个课时出现的
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已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值在练习册用配方法解一元二次方程那个课时出现的
已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值
在练习册用配方法解一元二次方程那个课时出现的
已知2x²-3xy-2y²=0,求(x+y)/(x-y)的值在练习册用配方法解一元二次方程那个课时出现的
2x²-3xy-2y²=0
(2x+y)(x-2y)=0
x=2y,或x=-y/2
所以
(x+y)/(x-y)
=(2y+y)/(2y-y)
=3
或=(-y/2+y)/(-y/2-2y)
=(y/2)/(-5y/2)
=-1/5