2015蔡依林广州演唱会:数学求救(初一)
来源：百度文库 编辑：中科新闻网 时间：2024/10/02 19:18:16
|x-y-3|+(2x+2y-6)^2=0,则(x+y)(x-y)=______?
x-y=3
2x+2y=6
x+y=3
=9
|x-y-3|+(2x+2y-6)^2=0,则
x-y-3=0,2x+2y-6=0
(x+y)(x-y)=18
9
x-y=3
2x+2y=6
x+y=3
=9
|x-y-3|+(2x+2y-6)^2=0,则
x-y-3=0,2x+2y-6=0
(x+y)(x-y)=18
9