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数学
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4x²-7x+4=0 则x²+x²分之一=
人气:428 ℃ 时间:2020-04-07 04:24:15
解答
4x²-7x+4=0 则x²+x²分之一=
4x²-7x+4=0
4x-7+4/x=0
x+1/x=7/4
(x+1/x)²=49/16
x²+x²分之一=17/16
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