(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100

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(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100(-1)×2×(-3)×4×···×(-

(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100

(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
分子中奇数为负,而1-50中有25个奇数,所以整体为负数.
2=1x2,4=2x2,6=3x2
所以分母等于各个分子的2倍.
上下约分后,
原式等于负的2的50次幂分之1.

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