已只a>0,b>0,且h=min{a,b/a^2+b^2],求证h扫码下载作业帮搜索答疑一搜即得
问题描述:
已只a>0,b>0,且h=min{a,b/a^2+b^2],求证h
扫码下载作业帮
搜索答疑一搜即得
答
已知a>0,b>0,且h=min{a,b/(a²+b²)},求证:h≤√2/2
∵a,b>0
a²+b²≥2ab--->a×b/(a²+b²)≤1/2
--->h = min{a,b/(a²+b²)}≤√(1/2) = √2/2