计算下面各题，能简算的请用简便方法计算．
8.38+9.43+6.62              5.86﹣1.77+2.54         47.2+8.6﹣7.2     
28.6﹣3.8﹣14.6﹣6.2        8﹣2.6﹣1.77            7.4+0.93﹣4.36
17.34﹣（9.8+6.34）         0.93+5.45+7.07+4.55．