(4/5-2/3)×5/8 =(96/120-80/120)×5/8 =2/15×5/8 =1/12 2/9+7÷9+4/5 =2/9+7/9+4/5 =10/45+35/45+36/45 =81/45 2-6/13÷9/26 =2-6/13×26/9 =2-3/4 =4/5
