(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?

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(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?(y&#

(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?
(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?

(y²-x²)/[2(y²-xy)]化简成(y+x)/(2y)对?
(y²-x²)/[2(y²-xy)]
=[(y+x)(y-x)]/[2y(y-x)]
=(y+x)/(2y)
对的.