(-1/63)/(1/9-2/7+2/3-4/21)怎么做?

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(-1/63)/(1/9-2/7+2/3-4/21)怎么做?(-1/63)/(1/9-2/7+2/3-4/21)怎么做?(-1/63)/(1/9-2/7+2/3-4/21)怎么做?(-1/63)/(1

(-1/63)/(1/9-2/7+2/3-4/21)怎么做?
(-1/63)/(1/9-2/7+2/3-4/21)怎么做?

(-1/63)/(1/9-2/7+2/3-4/21)怎么做?
(-1/63)/(1/9-2/7+2/3-4/21)
=(-1/63)/(1/9+6/9-6/21-4/21)
=(-1/63)/(7/9-10/21)
=(-1/63)/(49/63-30/63)
=(-1/63)/(19/63)
=-1/19

(-1/63)/(1/9-2/7+2/3-4/21)
=-1÷(1/9×63-2/7×63+2/3×63-4/21×63)
=-1÷(7-18+42-12)
=-1÷19
=-1/19