1.10-23+32-17-21+45
=(10+32+45)-(23+17+21)
=87-61
=26
2.（3又5/6）+（2又2/5）-（+2又1/6）-（-7又3/5）
=23/6+12/5-13/6+38/5
=35/3
3.-9.2-（-7.1）-（-3）+6又1/5+（+2.9）
=(6.2+2.9+7.1+3)-9.2
=19.2-9.2
=10
4.3.6+41.8-12又3/5-11-51又4/5
=45.4-(12.6+11+51.8)
=45.4-75.4
=-30
5.-1/8-2/5-4/9+2又3/8-3/5-5/9
=(19/8-1/8)-(2/5+3/5)-(4/9+5/9)
=9/4-1-1
=1/4