X^2-3XY-4Y^2=（X-4Y)(X+Y)=0
X1=4Y,(X-2Y)/(X-Y)=2Y/3Y=2/3
X2=-Y,(X-2Y)/(X-Y)=-3Y/-2Y=3/2
数学X^2-3XY-4Y^2=0(Y不等于0),则(X-2Y)/(X-Y)=?
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