Vreau urgent pentru maine : b) (10x la puterea a 5) : (5x la puterea a 3) , c) (14x la puterea a 6) : (7x la puterea a 3) , d) (-21 la puterea a 7) : (3x la puterea a 2) , e) (28x la puterea a 8) : (-4x la puterea a 2).