魅蓝note6参数:数学求救(初一)
来源:百度文库 编辑:高校问答 时间:2024/05/29 03:32:04
|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