0.375*四分之七+五分之八*1.75 和四分之九/（六分之五-（六分之一+三分之一））都要简算哦

0.375*7/4+8/5*1.75
=3/8*7/4+8/5*7/4
=7/4*(3/8+8/5)
=7/4*(15/40+64/40)
=7/4*79/40
=553/160
(9/4)/[5/6-(1/6+1/3)]
=(9/4)/[5/6-1/6-1/3]
=(9/4)/(4/6-1/3)
=(9/4)/(1/3)
=27/4