Question

[(17-15).3+(7-12).2] : [(6-7) . (12-23)]

Answer 1

Aqui esta lo hice paso por paso :D espero haber ayudado
[(51-45)+(14-24)] : [-1 . -11]
[6-10] : 11
-4 :11 = -0.36

Answer 2

[(17-15).3+(7-12).2] : [(6-7) . (12-23)]=

[(2).3+(-5).2] : [(-1) . (-11)] = 

[2.3 -5.2] : [-1 . -11] = 

[6 -10] : [ 11] = 

[-4] : [ 11] = 

-4 : 11 = 

-0.36