做一做，结果能约分的要约分，是假分数的要化成带分数．=========
用竖式计算下面各题．2.6+4.2 5.6+1.83.4+0.8 3.2﹣0.5．
列竖式计算．21.6﹣14.8 28.3+44.8 40﹣26.747.9+54.5 31.2﹣22.4 63.5+76.5．
过河．
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