用简便方法计算．
4.35+8.6+15.65+1.4                  19.32﹣5.56﹣3.44
37.6﹣（7.6+3.25）                  5.49+2.68﹣3.49
6.27+3.83+1.73                      8.4+3.5﹣8.4+3.5．