What is (-2)99th power -(-2)98th power -(-2)97th power?

What is (-2)99th power -(-2)98th power -(-2)97th power?

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20N is a factor of 2001×2000×1999×...×3×2×1, and the maximum natural number n can be ______.

20N=(2×2×5) n=2n×2n×5n, in which the number of 2 that can be decomposed in 2001×2000×1999×1998×...×3×2×1 is far more than the number of 5, so the maximum number of 5 that can be decomposed in 2001×2000×1998×...×3×2×1 is the maximum value of n,(2001÷5)+(2001÷2...