0.56*(2又5/12-1又19/60+2.275)/0.5
=0.56*（2又25/60-1又19/60+2.275）/0.5
=0.56*(1又6/60+2.275)/0.5
=0.56*(1.1+2.275)/0.5
=0.56*3.375/0.5
=1.89/0.5
=3.78
看似简单 其实还挺麻烦