已知-x+2y=5,则5(x-2y)2-3(x-2y)-60的值是(  ) A.80 B.10 C.210 D.40

问题描述:

已知-x+2y=5,则5(x-2y)2-3(x-2y)-60的值是(  )
A. 80
B. 10
C. 210
D. 40

∵-x+2y=5,
∴x-2y=-5,
原式=5(x-2y)2-3(x-2y)-60
=5×(-5)2-3×(-5)-60
=125+15-60
=80.
故本题选A.