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
答
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