5分之2-4分之3+10分之7
=(2/5+7/10)-3/4
=11/10-3/4
=7/20
5分之2-3分之1+2分之1
=(2/5+1/2)-1/3
=9/10-1/3
=17/30
8分之5+5分之2-16分之3
=(5/8-3/16)+2/5
=7/16+2/5
=67/80
32分之9-16分之3+5分之1
=3/32+1/5
=47/160
5分之2-4分之3+10分之7
=(2/5+7/10)-3/4
=11/10-3/4
=7/20
5分之2-3分之1+2分之1
=(2/5+1/2)-1/3
=9/10-1/3
=17/30
8分之5+5分之2-16分之3
=(5/8-3/16)+2/5
=7/16+2/5
=67/80
32分之9-16分之3+5分之1
=3/32+1/5
=47/160