Question

Folosind metoda factorului comun, calculeaza:
i) a*c-c*b daca a-b=24 si c=3;
ii) 7*a+9*b+2*c daca a+b=43 si b+c=15.

Answer 1

a-b = 24
c = 3
a×c - c×b = c×(a-b) = 3 × 24 = 72

a+b = 43
b+c = 15
7×a+9×b+2×c =
= 7×a + 7×b + 2×b + 2×c =
= 7×(a+b) + 2×(b+c) =
= 7×43 + 2×15 =
= 301 + 30 =
= 331