Question

Without calculating the cubes find the value (0.2)3 - (0.3)3 + (0.1)3

Answer 1

0.6-0.9+0.3=0.6+0.3-0.9=0.9-0.9=I

Answer 2

Here the identity used is
If a+b+c = 0
then , a^3+b^3+c^3= 3abc