Question

Va rog sa ma ajutati!
Sa se efectueze calculele cu formule de calcul prescurtat:
a)(x-3)(x-2)-(x+5)²+7(x+5)
b)3x(x+5)+(x-1)(x+4)-(x+3)²
c)(x+2)²+(x-1)²-2(x+4)(x-4)

Answer 1

a) = (xpatrat -2x-3x+6 ) - ( x patrat +2 • x• 5 + 5 la puterea 2) + 7x + 35= x patrat - 5x +6 - x patrat + 10x + 25 + 7x +35= 12x + 66

b) = 3xpatrat + 3x •5 + xpatrat +4x-x-4-xpatrat- 2•x•3= 3xpatrat +15x+xpatrat+3x - 4 - x patrat - 6x= 3xpatrat +18x -4

c) xpatrat + 2•x•2+2 la puterea 2 + xpatrat - 2•x•1 + 1 la puterea 2 - 2 ( xpatrat - 4 patrat) = xpatrat + 4x+4 + xpatrat -2x +1 - 2xpatrat - 32= 2x - 27