a) Ta có : 3111 < 3211 = (25)11 = 255
1714>1614 = (24)14=256
=> 3111 <255<256<1714
=>3111<1714
\(31^{11}< 32^{11}\Rightarrow31^{11}< \left(2^5\right)^{11}\Rightarrow31^{11}< 2^{55}\left(1\right)\)
\(17^{14}>16^{14}\Rightarrow17^{14}>\left(2^4\right)^{14}\Rightarrow17^{14}>2^{56}\left(2\right)\)
Từ 1 và 2 ta có:
\(31^{11}< 17^{14}\)