Respuesta :

Answer:

Step-by-step explanation:

(a) 3ab/4c + 9b/8ac

= 3ab(8ac) + 9b(4c) / 4c(8ac)

= 24a²bc + 36bc / 32ac²

= 6a²b + 9b / 8ac

(b) 4(3b+2c)

= 4(3b) + 4(2c)

= 12b + 8c

(c) 3a+3b-ca-cb

= 3a - ca + 3b - cb

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

= (a + b) (3 - c)