Question

without actually calculating ,use identities to find the value of (0.2)3-(0.3)3+(0.1)3

Answer 1

identity is that : (x) 3 +(y) 3+(Z) 3 = 3xyz
(0.2)3 +(-0.3)3+(0.1)3 = 3(0.2)(-0.3)(0.1)
so answer is 0.018