若(x-5)²=169,(y-1)³=-0.125,求根号x-根号2xy-立方根2y-x
问题描述:
若(x-5)²=169,(y-1)³=-0.125,求根号x-根号2xy-立方根2y-x
答
(x-5)^2=169,则,x-5=13,x=18
(y-1)^3=-0.125,则,y-1=-0.5,y=0.5
则,√x-√2xy-立方根2y-x
=√18-√18-立方根2y-x
=-立方根-17
=立方根17