(-1/30)/(1/3-1/5-1/15) 2个方法计算!算了 能给多少方法就给多少吧- =

(-1/30)/(1/3-1/5-1/15) 2个方法计算!算了 能给多少方法就给多少吧- =
(-1/30)/(1/3-1/5-1/15) 2个方法计算!
算了 能给多少方法就给多少吧- =

(-1/30)/(1/3-1/5-1/15) 2个方法计算!算了 能给多少方法就给多少吧- =
(-1/30)/(1/3-1/5-1/15)
=(1/30)/(1/5+1/15-1/3)
=(1/30)/(-1/15)
=-1/2
(-1/30)/(1/3-1/5-1/15)
=(-1/30)*30/[(1/3-1/5-1/15)*30]
=-1/(10-6-2)
=-1/2.