Question

So Sánh 2⁹¹ và 7³⁰

Answer 1

ta có: 2^91>2^90

ta thấy : 2^90= (2^3)^30= 8^30

mà 7^30<8^30

suy ra 2^91>7^30

Answer 2

Ta có: \(2^{91}< 2^{90}=\left(2^3\right)^{30}=8^{30}\)

Thấy: \(8^{30}>7^{30}\)

\(\Rightarrow2^{90}>7^{30}\)

Vậy: \(2^{91}>7^{30}\)