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.80B.10C.-210D.40已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为()A.80B.10C.-2
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