Question

Quanto é:
[(-1/2+1/3)².(1+1/5)]:[-3/5.(-2+1/3)²

Answer 1

  [(-3/6+2/6)².(5/5+1/5)]:[-3/5.(-6/3+1/3)... = 
[(-1/6)².(6/5)]:[-3/5.(-5/3)²] = 
[1/36.6/5]:[-3/5.25/9] = 
[6/180]:[-75/45] = 
[6/180].[-45/75] = 
[1/30].[-3/5] = -1/50

Answer 2

trabalha-se primeiro parenteses,após colchetes e cuida as operações.
[(1/36).(6/5)]:[-3/5.(25/9)]

[6/180]:[-75/45]
6/180 x (-45/75) = -270/13500 ou simplificada
1/30 x 9/15 =9/450