5/7×16÷5/21=5/7×16×21/5=(5/7×21/5)×16=3×16=48 祝你学习进步!
5/7×16÷5/21=5/7×21/5×16=3×16=485/7×21/5 很容易算出得 3
5/7×16÷5/21=5/7×21/5×16=3×16=48
5/7×16÷5/21=5/7×16×21/5=16×3=48