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数学
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已知,x+y=5,xy=3,求x²-y²
人气:107 ℃ 时间:2019-09-17 07:22:13
解答
x²-y²=(x+y)(x-y)=5(x-y)
(x-y)²=x²+y²-2xy=(x+y)²-4xy=25-12=13 x-y=±√3
5(x-y)=5√3或-5√3
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