一桶水用去一半多1/2升,还剩5/12,这桶水原来有( )升

问题描述:

一桶水用去一半多1/2升,还剩5/12,这桶水原来有( )升

1/2÷(1-5/12-1/2)=6升
答这桶水原来有6升