Respuesta :

Answer:

6

Step-by-step explanation:

15 - 1 ( 12 - 4 + 1 )

15 - 1 ( 8 + 1 )

15 - 1 ( 9 )

15 - 9

6

r3t40

[tex]15-1(12-4+1)=15-9=6[/tex].