Question

[kha duy tram]

so sánh 3^21 va 2^31

32^9 va 18^3

 ^ là mu

Answer 1

[Lê Song Thanh Nhã]

\(3^{21}=3.3^{20}=3.\left(3^2\right)^{10}=3.9^{10}\)

\(2^{31}=2.\left(2^3\right)^{10}=2.8^{10}\)

Vì \(3.9^{10}>2.8^{10}\)nên \(3^{21}>2^{31}\)