Question

daca a=14 iar b+c=25 aflați valoarea expresiilor a×b+a×c+5×a-16×b-16×c

Answer 1

    
[tex]a=14 \\ b+c=25 \\ a \times b + a \times c +5 \times a - 16 \times b- 16 \times c = \\ = a (b + c) +5 \times a - 16 (b+ c) = \\ = 14 \times 25 +5 \times 14 - 16 \times 25 = \\ = 350+70 - 400 = 420 + 400 = \boxed{820}[/tex]