5:
a: -1/27=(-1/3)^3
b: 36^6:(-18)^6
=(-36:18)^6=(-2)^6
c; =(-75:25)^3=(-3)^3
d: =(2/3:8/27)^3=(2/3*27/8)^3=(54/24)^3=(9/4)^3
e: =(7/5:14/18)^5=(9/5)^5
f: =(-1/7:1/7)^2018=1
4:
b: (-2/3)^4=16/81
c: (-1/3)^3=-1/27
a: =(0,25)^3=(1/25)^3=1/15625
d: =(-12/7)^2=144/49
f: (-3/25)^0=1