1.

Without actual calculating the cubes, find the value of each of (0.2)3 – (0.3)3 + (0.1)3

Answer»

Given that (0.2)3 – (0.3)3 + (0.1)3 

= (0.2) + (- 0.3) + (0.1) 

Sum of the bases 

= 0.2 – 0.3 + 0.1 = 0

∴ (0.2)3 + (-0.3)3 + (0.1)3 

= 3 x (0.2) (- 0.3) (0.1) 

= -0.018



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