(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100
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(-1)×2×(-3)×···×(-49)×50×(-2的5次方)----------2×4×6····×100(-1)×2×(-3)×···×(-49)×50×(-2的5次方)----------2
(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100
(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100
(-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!
(-1)×2×(-3)×···×(-49)×50×(-2^5)=(-1)^25*50!*(-2^5)=(32)*50!
2×4×6····×100=2*1*2*2.......*2*50=(2^50)*50!
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(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100
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