已知x-2y=5,则5(x-2y)²-3(x-2y)-60的值为() A.50 B.10 C.210 D.40
1个回答
5(x-2y)²-3(x-2y)-60
=5×5²﹣3×5﹣60
=125﹣15﹣60
=50
∴选A.50
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