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|x-y+5|+(3x+y-1)的平方=0怎样解..?
人气:192 ℃ 时间:2020-04-09 13:55:25
解答
|x-y+5|>=0 (3x+y-1)^2>=0
|x-y+5|+(3x+y-1)^2>=0
|x-y+5|=0 (3x+y-1)^2=0
x-y+5=0 3x+y-1=0
x=-1 y=4
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