Question

Se stie ca: a×b+a×c=42 si b+c=7 . Afla valoarea lui a

Answer 1

$a \times b + a \times c = 42$

$b + c = 7$

$a(b + c) = 42$

$a \times 7 = 42$

$a = \frac{42}{7}$

$a = 6$

Answer 2

dam factor comun pe a
a*(b+c)=42
7*a=42
a=6