若a/b*b=2/45,则a+b的最小值为多少?
问题描述:
若a/b*b=2/45,则a+b的最小值为多少?
答
2/45 = 2/(3*3*5) = (2*5)/(3*3*5*5) = 10/(3*5 * 3*5) ===> a = 10,b=3*5 = 15.a+b的最小值25
若a/b*b=2/45,则a+b的最小值为多少?
2/45 = 2/(3*3*5) = (2*5)/(3*3*5*5) = 10/(3*5 * 3*5) ===> a = 10,b=3*5 = 15.a+b的最小值25