已知|x-5|+(y+2x+6)²=0,则3x+y+1=
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已知|x-5|+(y+2x+6)²=0,则3x+y+1=
已知|x-5|+(y+2x+6)²=0,则3x+y+1=
已知|x-5|+(y+2x+6)²=0,则3x+y+1=
答:
|x-5|+(y+2x+6)²=0
等式左边为非负数
所以:
x-5=0
y+2x+6=0
解得:
x=5,y=-16
所以:
3x+y+1
=15-16+1
=0
所以:3x+y+1=0