计算：5x-2y-6+ (1/x) + (1/y)
问题描述：
计算：5x-2y-6+ (1/x) + (1/y)
答
5x-2y-6+ (1/x) + (1/y)
=5x-2y-6+ 1/x + 1/y
还需要通分吗?需要通分=(5x²y-2xy²-6xy+x+y)/(xy)