(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100

问题描述:

(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100

(-1)×2×(-3)×···×(-49)×50×(-2的5次方)
=50!×(-2^5)
=-32×50!.
2×4×6····×100=100!