Efectuați, utilizând formula (a - b)² = a² - 2ab + b²: a (x - 2)²; b (a − 1)²; c (4- b)²; e (2a - b)²; f (x - 4y)²; g (5a - 6m)²; 1 (2-3√2)³; 1 (2√3-3√6)²; m n 2a 3 X 4 k (5√2x-3√3y); d (5-2c)²; h (2z - 10t)²; 1 (3√14x-2√21y); 16 25
am nevoie urgent
