1.25x（37+53+1）=113.75
1.25x37+12.5x5.3+1.25=1.25x(37+53+1）=1.25x81=113.75
1.25×37＋12.5×5.3＋1.25＝1.25×37＋1.25×5.3×10＋1.25＝1.25×（37＋5.3×10＋1）＝1.25×（37＋53＋1）＝1.25×91＝113.75
