Ta có: 430 = 230 . 230 = (23)10 . (22)15 > 810 . 315 > (810 . 310) . 35 > 2410 . 3
Vậy 230 + 330 + 430 > 3.2410
\(4^{30}=2^{30}.2^{30}=\left(2^3\right)^{10}.\left(2^2\right)^{15}>8^{10}.3^{15}>\left(8^{10}.3^{10}\right).3^5>24^{10}.3\)
Vậy \(2^{30}+3^{30}+4^{40}>3.32^{10}\)
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