Question

whole cube of 999 using identity

Answer 1

(1000-1)^3 = (1000)^3-(1)^3-3*1000*1(1000-1)
hope after this u can solve

Answer 2

(999)^3

(1000-1)^3

(1000)^3-(1)^3-3×1000×1(1000-1)

1000000000-1-3000(1000-1)

1000000000-1-3000000+3000

997002999