一、除以一个数等于乘以这个数的倒数 15÷3/4 =15 x 4/3 =20 26÷13/14 =26 x 14/13 =28 1/6÷2/3 =1/6 x 3/2 =1/4 3/8÷3/16 =3/8 x 16/3 =2 二、2/8÷6 = 2/8 x 1/6 =1/24(千克) 答:~~