数学题 刚才的
发布网友
发布时间：2023-09-18 12:32
共2个回答
热心网友
时间：2024-11-01 04:15
=2xy/(x²-y²)+x(x-y)/(x²-y²)+y(x+y)/(x²-y²)
=(2xy+x²-xy+xy+y²)/(x²-y²)
=(x²+2xy+y²)/(x²-y²)
=(x+y)²/(x+y)(x-y)
=(x+y)/(x-y)
热心网友
时间：2024-11-01 04:15
