Question

Dacă a+b=12 si b+c=15,calculati
(7a+7b)×(2b+2c)=​

Answer 1

Răspuns:

Explicație pas cu pas:

(7a + 7b) × (2b + 2c) =

7 x (a + b) x 2 x (b + c) =

7 x 12 x 2 x 15 =

84 x 30 =

2520​

Answer 2

a + b = 12

b + c = 15

( 7 a + 7 b ) × ( 2 b + 2 c ) =

[ 7 × ( a + b ) ] × [ 2 × ( b + c ) ] =

( 7 × 12 ) × ( 2 × 15 ) =

84 × 30 = 2520