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
答
1/2÷(1-5/12-1/2)=6升
答这桶水原来有6升