Daca a=15 si b+c=12,calculati:

ab+ac+3b+3c


Răspuns :

a=15 ; b+c = 12

ab+ac+3b+3c = a(b+c) +3(b+c) = (a+3)(b+c) = (15+3)*12 = 18*12 = 216

*=inmultire

a = 15 si b + c = 12

ab + ac + 3b + 3c = a ( b + c ) + 3 ( b + c ) = 15 x 12 + 3 x 12 = 180+36 = 216