\(a)\)
Cách 1 :
\(2^{30}+3^{30}+4^{30}\ge3\sqrt[3]{\left(2.3.4\right)^{30}}=3.\left(2.3.4\right)^{10}=3.24^{10}\) ( Cosi )
Mà \(2^{30}\ne3^{30}\ne4^{30}\) nên dấu "=" không xảy ra hay \(2^{30}+3^{30}+4^{30}>3.24^{10}\)
Vậy ...
Cách 2 :
\(4^{30}=4^{11}.4^{19}=4^{11}.2^{38}>3^{11}.2^{30}=3.3^{10}.8^{10}=3.24^{10}\)
Vậy ...
\(b)\)\(4+\sqrt{33}=\sqrt{16}+\sqrt{33}>\sqrt{14}+\sqrt{29}\)
Vậy ...