数学计算(-1/63)/(1/9-2/7+2/3)要有过程啊,

问题描述:

数学计算(-1/63)/(1/9-2/7+2/3)要有过程啊,

(-1/63)/(1/9-2/7+2/3)
=(-1/63)/(7/63-2*9/63+2*21/63)
=(-1/63)/(31/63)
=-1/31