n^7=7^7 => n=7 => 7^7=7^7
n^10≤1 => n=1 => 1^10=1 =>1=1
3^n=7^n => n=0 => 3^0=7^0 => 1=1
6^13≥n^13 => n=6 => 6^13≥6^13 ( dar ,,n,, poate fi si 1;2;3;4 si 5}
ex:6^13>5^13
3^n<32 => n=3 => 3^3<2^5 => 27<32
n^2≤81 => n=9 => 9^2≤81 => 81≤81 (dar ,,n,,poate fi si 1;2;3;4;5;6;7 si 8}
ex: 8^2<81
100≥3^n+1 => n=4 => 10^2>3^4+1 => 100> 81+1
100<5^n<650 => n=4 => 10^2<5^4<650 => 100<625<650