能简算的要简算.1/5÷6/25-2/7×7/8
问题描述:
能简算的要简算.1/5÷6/25-2/7×7/8
答
1/5÷6/25-2/7×7/8
=1/5×25/6-1/4
=5/6-1/4
=10/12-3/12
=7/12