1.一根钢管,用去25%,正好用去6/7米,这根钢管一共多少米?

问题描述:

1.一根钢管,用去25%,正好用去6/7米,这根钢管一共多少米?
2.一根钢管,用去25%,正好剩下6/7米,这根钢管一共多少米?3.一根钢管,用去25%,正好用去6/7米,这根钢管还剩多少米?

这根钢管一共:6/7米÷(1-25%)=6/7×4/3=8/7米
用去6/7米,还剩:8/7-6/7=2/7米