49×4948/49简算

15乘四十九分之四十八乘六十分之二十八可以简算吗 -
15×48/49×28/60 =15/1x28/60x48/49 =15/1×(4×12)/(7x7)x48/49 =15/1x(4x7)/(4x15)x48/49 =(15x4x7)/(1x4x15)x48/49 =7x48/49（约掉了4x15）(7x48)/(7x7)=48/7（约掉了7）6又6/7
49*100=4900+49=4949-1=4948,我觉得这样简单点哈.