Răspuns :
b - c = 7, a = 14, b = 21
a × ( b - c ) + a × b =
= 14 × 7 + 14 × 21 =
= 14 × ( 7 + 21 ) = → am dat factor comun pe 14
= 14 × 28 =
= 392
b - c = 7, a = 14, b = 21
a × ( b - c ) + a × b =
= 14 × 7 + 14 × 21 =
= 14 × ( 7 + 21 ) = → am dat factor comun pe 14
= 14 × 28 =
= 392