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

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 23:52:00
已知-x+2y=5,则5(x-2y)^2-(x-2y)-50的值为( )A.80 B.10 C.-210 D.40
xPQKP+ tv] VcR? FFVP1)h&>WݝO U>,||&%Whc9$㚄Ȯi&֋g9ϮdY6m H%^OjbdRO+m1|[E>U1ߠ$s }}{7:U&^(V{Ԛ>őP<: N5'GrL}k2~;M 3UǴ=x-xIZEbo3{:AY[t{NKVFԶ4k00i@D6@[?x4

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