3-4/11-7/11
问题描述：
3-4/11-7/11
17×13/16
答
3-4/11-7/11
=3-(4/11+7/11)
=3-1
=2
17×13/16
=(16+1)×13/16
=16×13/16+1×13/16
=13+13/16
=13又16分之13