Question

Daca a+b=25 si b+c=35 ,calculati 3a+6b+c

Answer 1

a + b = 25 si b + c = 35 ,calculati 3a+6b+c

3a + 6b + 3c = 3a + 3b + 3b + 3c =

3 (a+b) + 3 (b+c) =

3×25 + 3×35 =

75 + 105 =

3a + 6b + 3c = 180

sau

(a + b) + (b + c) = 25 + 35

a + 2b + c = 60 daca inmultim cu 3 ⇒

3a + 6b + 3c = 180 , exact ce ne doream!!!!!