x+y/x-y=( )/x²-y² 分式填空
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x+y/x-y=( )/x²-y² 分式填空
x+y/x-y=( )/x²-y² 分式填空
x+y/x-y=( )/x²-y² 分式填空
(x+y)²
分子分母同时乘(X+Y)
x+y/x-y=( x+y)² /x²-y²
x²-y² =(x+y)(x-y),所以x+y/x-y分子分母都乘以x+y