Question

folosind formule de calcul prescurtat,calculeaza :a)23^2 b)45^2

Answer 1

23² = (20+3)² = 20²+2×20×3+3² = 400+120+9 = 529 ;

45² =(40+5)²=40²+2×40×5+5² = 1600+400+25 = 2025 ;