1/4x5+6.5x25/100-0.25x1.5=0.25x5 +6.5x0.25-0.25x1.5=0.25x(5+6.5-1.5)=0.25x10=2.5
1/4*5+6.5*25％-0.25*1.5＝1/4*5+6.5*1/4-1/4*1.5＝1/4*（5+6.5-1.5）＝1/4*10＝2.5
