已知-x+2y=5,求5(x-2y)²-3x+6y-60大哥大姐帮帮忙

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/24 04:53:24
已知-x+2y=5,求5(x-2y)²-3x+6y-60大哥大姐帮帮忙已知-x+2y=5,求5(x-2y)²-3x+6y-60大哥大姐帮帮忙已知-x+2y=5,求5(x-2y)&s

已知-x+2y=5,求5(x-2y)²-3x+6y-60大哥大姐帮帮忙
已知-x+2y=5,求5(x-2y)²-3x+6y-60
大哥大姐帮帮忙

已知-x+2y=5,求5(x-2y)²-3x+6y-60大哥大姐帮帮忙
因为-x+2y=5
所以x-2y=-5
所以
5(x-2y)²-3x+6y-60
=5(x-2y)²-3(x-2y)-60
=5*25-3*(-5)-60
=125+15-60
=140-60
=80