Question

Calculati , utilizand formulele de calcul prescurtat:
a) (1+a) la a doua + (2+a) la a doua + (3+a) la a doua
b) (x-2y) la a doua (x -2y)×(x+2y)
c)(3x-2) la a doua + 5x(x - 3)
d)(3x + y) la a doua + (x - y)
e)(1-3y) la a doua +(1+3y) la a doua - 18 y la a doua
f) (a la a doua+b la a doua) -(a la a doua - b la a doua

Answer 1

Formule:
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
a²-b²=(a+b)(a-b)
a(b+c)=ab+ac