小龙和小燕住在同一幢楼里，这幛楼相邻两层间的楼梯级数相同．小燕住在5楼，回家要走72级楼梯，小龙回家要走108级楼梯．小龙住在几楼？
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直接写出得数．============
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直接写出得数．== 1﹣= 4﹣=====
计算下面各题．．
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