Question

using formula simplify the two questions​

Answer 1

Answer:

It is solved using (a-b)^3= a^3-3a^2b+3ab^2+b^3

997^3=(1000-3)^3=1000^3-3×1000^2×3+3×1000×3^2-3^3=1000000000-9000000+27000-27=991026973

89^3=(100-11)^3=100^3-3×100^2×11+3×100×11^2-11^3=1000000-330000+36300-1331=704969

Hope it helps.

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