化简:(x√y)⼀(x√y-y√x)-(y√x)⼀(x√y+y√x),并任选一组你认为合适x,y的值

2024-11-17 20:35:57
推荐回答(1个)
回答1:

原式=(x√y)(x√y+y√x)/(x√y-y√x)(x√y+y√x)-(y√x)(x√y-y√x)/(x√y+y√x)(x√y-y√x)
=(x²y+xy√xy)/(x²y-y²x)-(xy√xy-xy²)/(x²y-y²x)
=(x²y+xy√xy-xy√xy+xy²)/(x²y-y²x)
=(x²y+xy²)/(x²y-y²x)
=(x+y)/(x-y)
当x=2 y=1 原式=3