已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40

问题描述:

已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )
A.80 B.10 C.-210 D.40