已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
1个回答
X²+3XY-4Y²=0
(x+4y)(x-y)=0
x=y 或 x=-4y
若x=y,则
X-Y/X+Y=0
若x=-4y,则
X-Y/X+Y=-5y/(-3y)=5/3
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