Răspuns:
= [(-2/3)⁶:(-2/3)⁴+(2/3)⁸:(-2/3)⁶]:(-2/3)²
=[(2/3)²+(2/3)²]:(-2/3)²
=(4/9+4/9):(-2/3)²
=8/9:4/9
=8/9×9/4
=2
(14/21)⁽⁷=2/3
(18/27)⁽⁹=2/3
(8/12)⁽⁴=2/3
