a+b/2ab
问题描述:
a+b/2ab
数学人气:676 ℃时间:2020-03-18 13:00:01
优质解答
因为a+b≥2√(ab),则:1/(a+b)≤1/[2√(ab)],所以:
2ab/(a+b)≤2ab/[2√(ab)]=√ab,即:2ab/[a+b]≤√(ab)
2ab/(a+b)≤2ab/[2√(ab)]=√ab,即:2ab/[a+b]≤√(ab)
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答
因为a+b≥2√(ab),则:1/(a+b)≤1/[2√(ab)],所以:
2ab/(a+b)≤2ab/[2√(ab)]=√ab,即:2ab/[a+b]≤√(ab)