2米长的铁丝,用去2/3还剩多少米?2米长的铁丝,用去全长的2/3还剩全长的几分之几?

问题描述:

2米长的铁丝,用去2/3还剩多少米?2米长的铁丝,用去全长的2/3还剩全长的几分之几?

2x(1-2/3)
=2x1/3
=2/3(米)
1-2/3=1/3
用去2/3还剩2/3米,剩下全长的1/3