3.75÷35/42-7/35÷4/15
问题描述：
3.75÷35/42-7/35÷4/15
答
3.75÷35/42-7/35÷4/15
=3又3/4 ÷ 5/6 - 1/5× 15/4
=15/4 ×6/5 - 1/5× 15/4
=15/4 ×(6/5 - 1/5)
=15/4
=3又3/4