已知-x+2y=5,则5(x-2y)^2 -8(x-2y)-5的值为（）A.80 B.-170 C.160 D.60

来源：学生作业帮助网编辑：作业帮时间：2024/05/11 00:23:18

已知-x+2y=5,则5(x-2y)^2 -8(x-2y)-5的值为（）A.80 B.-170 C.160 D.60
已知-x+2y=5,则5(x-2y)^2 -8(x-2y)-5的值为（）
A.80 B.-170 C.160 D.60

已知-x+2y=5,则5(x-2y)^2 -8(x-2y)-5的值为（）A.80 B.-170 C.160 D.60
C.160
-x+2y=5
x-2y=-5
5(x-2y)^2 -8(x-2y)-5
=5*25-8*(-5)-5
=125+40-5
=165-5
=160

已知-x+2y=5,则5(x-2y)^2 -8(x-2y)-5的值为（ ）A.80 B.-170 C.160 D.60