About Lesson
14.3 Proof of Inequalities 不等式的证明
Prove the following inequalities 证明以下不等式
(1) > ,
(1) > ,
(2) , x, y > 0
(3) > ,
(4) Prove that ,
Hence or otherwise, prove that (x + y + z)2 3 (xy + yz + xz)
Hence or otherwise, prove that (x + y + z)2 3 (xy + yz + xz)
证明 ,
据此或其他方法,证明 (x + y + z)2 3 (xy + yz + xz)