计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
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计算(x+y/x-y+4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）计算(x+y/x-y+4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）计算(x+y/x-y+4xy/y
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
=[(x+y/x-y -4xy/(x+y)(x-y)](x+3y)(x-3y)/(x+3y)(x-y).(平方差公式、十字相乘法）
=[（x-y）的平方/(x+y)(x-y)](x+3y)(x-3y)/(x+3y)(x-y).(通分,完全平方公式）
=（x-3y)/(x+y).（约分,化简）
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
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(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)
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已知X>Y,x2+Y2=4xy.求(X+Y)/(X-Y)=?
因式分解x2+y2-xy-x-y+1
若x-y/x+y=2,则x2+2xy+y2/4xy=多少