5/6*0.2+12/13除以6:16/3除以4/5-1/3*3/4
=[5/6*1/5+12/13*1/6]/6:[16/3*5/4-1/4]
=[1/6+2/13]/6:[77/12]
=25/468:77/12
=25/3003
;5/8*3/25除以8/5=
=5/8*3/25*5/8
=3/64
;5/9*2/4=
=5/18