已知abc均为正实数,且ab+bc+ca=1............................................................

2024-11-27 14:29:46
推荐回答(2个)
回答1:

√a/bc+√b/ac+√c/ab
=[(√a)^3+(√b)^3+(√c)^3]/abc
=[(√a)^3+(√b)^3+(√c)^3](ab+bc+ca)/abc
=[(√a)^3+(√b)^3+(√c)^3][(√ab)^2+(√bc)^2+(√ca)^2]/abc

>=3(√a√b√c)(√ab√bc+√ab√ca+√bc√ca)/abc

=3[√(abc)][√(abc)](√a+√b+√c)/abc
=3abc(√a+√b+√c)/abc
=3(√a+√b+√c)
当且仅当a=b=c时等号成立。

谢谢

回答2: