1 . 5⁴⁴⁴ = ( 5² )²²² = 25²²²
3⁶⁶⁶ = ( 3³ )²²² = 27 ²²²
stim 25 < 27 ; atunci 25²²² < 27²²²
numarul subunitar ( 25 / 27 ) ²²² < 1
atunci 5⁴⁴⁴ / 3⁶⁶⁶ < 1
2. 77 / 99 = 7 / 9 ; 777 / 999 = 7 /9
9 / 7 · ( 7 / 9 + 7 / 9 + 7 / 9 ) - 111 / 700 : ( 100 + 10 + 1) / 700
= 9 · 7 · 3 / 7· 9 - 111 · 700 / 700 · 111
= 3 - 1 = 2
3. numitor 6
x + 5 ·3 > 5 ·6 ·( x -2) - 2 ·6
x + 15 > 30x - 60 -12
15 + 60 + 12 > 30x - x
29x < 87
x < 87 :29
x < 3
x numar natural
x ∈ { 0 ; 1 ; 2 }
