eight times the sum of a number and its reciprocal results in 34 _数学解答

eight times the sum of a number and its reciprocal results in 34 如何翻译求达人!

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解答

正实数和它倒数的和的最少值是多少?设这个正实数为a那么他的倒数就是1/a 那么a+1/a>=2倍根号（a×1/a)=2 当a=1/a,也就是a=1的时候