28.6-5.6÷0.25=28.6-(5.6x4)÷(0.25x4)=28.6-22.4÷1=6.2
原式＝28.6－5.6÷1／4＝28.6－5.6×4＝28.6－22.4＝6.2
28.6-5.6/1*4＝28.6-22.4＝6.2
28.6×1/4-5.6×1/41/4（28.6-5.6）1/4×235.75
