1.

Evaluate: (1005)3

Answer»

= (1000 + 5)3 

= (1000)3 + (5)3 + 3 × 1000 × 5 × (1000 + 5) 

= 1000000000 + 125 + 15000 + (1000 + 5) 

= 1000000000 + 125 + 15000000 + 75000 

= 1015075125



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