已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40
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![已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40](/uploads/image/z/1085615-71-5.jpg?t=%E5%B7%B2%E7%9F%A5-x%2B2y%3D5%2C%E5%88%995%28x-2y%29%5E2-%28x-2y%29-50%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89A.80+B.10+C.-210+D.40)
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已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40
已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )
A.80 B.10 C.-210 D.40
已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40
-x+2y=5
x-2y=-5
5(x-2y)^2-2(x-2y)-50
=5*(-5)^2-(-5)-50=125+5-50=80
5(x-2y)^2-(x-2y)-50
=5×(-5)²-(-5)-50
=5×25+5-50
=80
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)
A
A
A吧
25*5-(-5)-50=80
A
自己算的,要解答过程吗?
^是什么?题上真的有吗
A