Question

So sánh: 

 63 ¹⁵ và 34¹⁸

Answer 1

63\(^{15}\)lớn hơn 34\(^{18}\)

Answer 2

Ta có: \(63^{15}< 64^{15}\Rightarrow63^{15}< \left(2^6\right)^{15}\Rightarrow63^{15}< 2^{90}\)

          \(34^{18}>32^{18}\Rightarrow34^{18}>\left(2^5\right)^{18}\Rightarrow34^{18}>2^{90}\)

Suy ra: \(63^{15}< 2^{90}< 34^{18}\)

Vậy \(34^{18}>63^{15}\)

Answer 3

Ta có: \(63^{15}< 64^{15}=\left(2^6\right)^{15}=2^{90}=\left(2^5\right)^{18}=32^{18}< 34^{18}\)

\(\Rightarrow63^{15}< 34^{18}\)