1、(-83)+(+26)+(-41)+(+15),2.(+14)+(-4)+(－2)+(+26)+(－3)
=-83+26-41+15
=-83+（26+14-41）
=83+0
=-83
2、(+14)+(-4)+(－2)+(+26)+(－3)
=14-4-2+26-3
=14+26-（4+2+3）
=40-9
=31
3.（-9.6）+1.5+（-0.4）+（-0.3）+8.5
=-9.6+1.5-0.4-0.3+8.5
=(1.5+8.5)-(9.6+0.4)-0.3
=10-10-0.3
=-0.3