已知:(x-7)²+121,(y+1)³=-0.064,求根号x-2-根号x+10y+³根号245y的值已知:(x-7)²=121,(y+1)³=-0.064,求根号x-2-根号x+10y+³根号245y的值

已知:(x-7)²+121,(y+1)³=-0.064,求根号x-2-根号x+10y+³根号245y的值
已知:(x-7)²=121,(y+1)³=-0.064,求根号x-2-根号x+10y+³根号245y的值

x-7==±11
x=-4,x=18
y+1=-0.4
y=-1.4
根号有意义则x-2>=0
所以x=18
原式=√16-√4+³√(-343)
=4-2+(-7)
=-5