【x-15】=169,【y-1】的立方=-0.125,求根号x-根号2x*2y-2y-x的立方根
问题描述：
【x-15】=169,【y-1】的立方=-0.125,求根号x-根号2x*2y-2y-x的立方根
答
【x-15】的平方=169,【y-1】的立方=-0.125,
x-15=±13 x=28或2
y-1=-0.5 y=0.5
根号x-根号2x*2y-2y-x的立方根
=根号28-根号2*28*2*0.5-（2*0.5-28）的立方根
=2根号7-2根号14+1
或
根号x-根号2x*2y-2y-x的立方根
=根号2-根号2*2*2*0.5-（2*0.5-2）的立方根
=根号2-2+1
=根号2-1