若|x-y+2|+(x-4)²=0则x+2y=
5个回答
|x-y+2|+(x-4)²=0
两个非负数之和为0,这两个非负数一定为0
即有 x-y+2=0 且 x-4=0
解得 x=4 y=6
则 x+2y=4+6×2=4+12=16
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