微积分Find two positive numbersFind two positive numbers whose product is 36 and whose sum is a minimum.

问题描述:

微积分Find two positive numbers
Find two positive numbers whose product is 36 and whose sum is a minimum.

题意为:找出满足以下条件的两个正实数:积为36,和最小.
x>0,y>0,xy=36,
f(x)=x+y=x+36/x
x=6时,f(x)有最小值36,y=36/6=6