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数学
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已知(x-y-1)²与√5x-3y-11互为相反数,求x²+y²的平方根
人气:220 ℃ 时间:2020-03-29 12:56:38
解答
x-y-1=0
5x-3y-11=0
所以x=4,y=3
x^2+y^2=25
所以x²+y²的平方根是5和-5.不好意思x^2+y^2=25,^是神马?x²+y²=16+9=25
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