Question

2.375除以十五分之十一加二十八分之二十五减0.875,等于几分之几？

Answer 1

2.375÷11/15+25/28-0.875
=19/8×15/11+25/28-7/8
=285/88-7/8+25/28
=285/88-77/88+25/28
=208/88+25/28
=26/11+25/28
=728/308+275/308
=1003/308

Answer 2

2.375=2375/1000
=(2375÷25)/(1000÷50)
=95/40
=19/8
又0.875=875/1000
=(875÷25)/(1000÷25)
=35/40
=7/8
原题
2.375÷11/15+25/28-0.875
=19/8×15/11+25/28-7/8
=285/88+50/56-49/56
=285/88+1/56
=(285×7)/(88×7)+11/(56×11)
=1995/616+11/616
=2006/616
=1003/308
=3又79/308