求计算:根号x+根号y-(根号xy+x)乘根号1/x

问题描述:

求计算:根号x+根号y-(根号xy+x)乘根号1/x

根号x+根号y-(根号xy+x)乘根号1/x
=根号x+根号y-根号xy乘根号1/x-x乘根号1/x
=根号x+根号y-根号y-根号x
=0根号xy乘根号1/x-x 这一步 我不懂-x在根号里面吗?分配律啊