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

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

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