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．
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．
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