272×271分之37=(271+1)*37/271=37+37/271=37又37/27199乘7分之3＋7分之3=（99+1）*3/7=100*3/7=300/7 27×26分之21 =(26+1)*21/26=21+21/26=21又21/2645乘46分之27 =(64-1)*27/46=27-27/46=26又19/46...