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数学
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已知5x^2-3x-5=0,求5x^2-2x-(1/5^2-2x-5)的值
人气:497 ℃ 时间:2020-01-24 05:54:21
解答
5x-3x-5=0 5x-5=3x x-1/x=3/5;代入下式 那么:5x-2x-1/(5x-2x-5) =(5x-3x-5)+(5+x)-1/[(5x-3x-5)+x] =5+x-1/x =5+3/5 =28/5
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