Question

Dacă a×b=91,iar a×c=260. Calculează a×(b+c) ×2.

Answer 1

a×b + a×c = 91 + 260 = 351 
a× ( b +c)  = 351 
a×( b +c) × 2 = 351 ×2 =702

Answer 2

$a*b=91 \\ a*c=260 \\ a*(b+c)*2=? \\ a*(b+c)=a*b+a*c=91+260=351 \Rightarrow a*(b+c)=351 \\ a*(b+c)*2=351*2=702 \Rightarrow a*(b+c)*2=\boxed{702}$