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