：(12又1/3-3又3/4÷5/14) /(7/16×2又2/3+1/7)×1又10/11 =(37/3-15/4÷5/14)/(7/16×8/3+1/7)×21/11 =(37/3-15/4×14/5)/(7/6+1/7)×21/11 =(37/3-21/2)/[(49+6)/42]×21/11 =11/6×42/45×21/11 =49/15
