(-1/63)/(1/9-2/7+2/3-4/21)怎么做?

问题描述:

(-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