(-1/42)/(-3/7+5/6-9/14+1/3)=?
问题描述：
(-1/42)/(-3/7+5/6-9/14+1/3)=?
答
(-1/42)/(-3/7+5/6-9/14+1/3)
=(-1/42)/(-6/14-9/14+5/6+2/6)
=(-1/42)/(-15/14+7/6)
=(-1/42)/(-1-1/14+1+1/6)
=(-1/42)/(-3/42+7/42)
=(-1/42)/(4/42)
=-1/42*42/4
=-1/4