Question

(1000)cube - (999)cube means 3

Answer 1

1000= 1000000000
999= =997,002,999

Answer 2

Hi ,

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We know the algebraic identity ,

a³ - b³ = ( a - b )³ + 3ab ( a - b )

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Here ,

a = 1000 , b = 999

(1000)1 - ( 999)³

=(1000-999)³+3×1000×999(1000-999)

= 1³ + 3000 × 999

= 1 + 2997000

= 29997001

I hope this helps you

: )