eight times the sum of a number and its reciprocal results in 34 如何翻译 求达人!
问题描述:
eight times the sum of a number and its reciprocal results in 34 如何翻译 求达人!
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