（统筹方法）如果5个矿泉水空瓶可以换三瓶矿泉水 矿泉水可以用来煲养生烫吗
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\u77ff\u6cc9\u6c34\u4e00\u822c\u542b\u9499\u3001\u9541\u8f83\u591a\uff0c\u6709\u4e00\u5b9a\u786c\u5ea6\uff0c\u5e38\u6e29\u4e0b\u9499\u3001\u9541\u79bb\u5b50\u72b6\u6001\uff0c\u6781\u6613\u88ab\u4eba\u4f53\u5438\u6536\uff0c\u716e\u6cb8\u65f6\u9499\u3001\u9541\u6613\u4e0e\u78b3\u9178\u6839\u751f\u6210\u6c34\u57a2\u6790\u51fa\uff0c\u8fd9\u6837\u65e2\u4e22\u5931\u4e86\u9499\u3001\u9541\uff0c\u8fd8\u9020\u6210\u4e86\u611f\u5b98\u4e0a\u7684\u4e0d\u9002\uff0c\u6240\u4ee5\u77ff\u6cc9\u6c34\u6700\u4f73\u996e\u7528\u65b9\u6cd5\u662f\u5728\u5e38\u6e29\u4e0b\u996e\u7528\uff0c\u6240\u4ee5\u77ff\u6cc9\u6c34\u4e0d\u5b9c\u716e\u996d\u3001\u7172\u6c64\u3002
15个首先可以换9瓶水。九瓶水喝完后换3瓶余4个空瓶。三瓶喝完共有7个空瓶。再换三瓶水余2空瓶。喝完是5个空瓶，可再换3瓶水。共换18瓶水余3个空瓶。借2空瓶可换3瓶水。喝完后还瓶余1空瓶。共换21瓶水，余一空瓶。绛旓細15涓鍏堝彲浠ユ崲9鐡舵按銆備節鐡舵按鍠濆畬鍚庢崲3鐡朵綑4涓绌虹摱銆備笁鐡跺枬瀹屽叡鏈7涓┖鐡躲傚啀鎹笁鐡舵按浣2绌虹摱銆傚枬瀹屾槸5涓┖鐡锛屽彲鍐嶆崲3鐡舵按銆傚叡鎹18鐡舵按浣3涓┖鐡躲傚2绌虹摱鍙崲3鐡舵按銆傚枬瀹屽悗杩樼摱浣1绌虹摱銆傚叡鎹21鐡舵按锛屼綑涓绌虹摱銆
绛旓細15涓鍏堝彲浠ユ崲9鐡舵按銆備節鐡舵按鍠濆畬鍚庢崲3鐡朵綑4涓绌虹摱銆備笁鐡跺枬瀹屽叡鏈7涓┖鐡躲傚啀鎹笁鐡舵按浣2绌虹摱銆傚枬瀹屾槸5涓┖鐡锛屽彲鍐嶆崲3鐡舵按銆傚叡鎹18鐡舵按浣3涓┖鐡躲傚2绌虹摱鍙崲3鐡舵按銆傚枬瀹屽悗杩樼摱浣1绌虹摱銆傚叡鎹21鐡舵按锛屼綑涓绌虹摱銆
绛旓細15涓鍏堝彲浠ユ崲9鐡舵按銆備節鐡舵按鍠濆畬鍚庢崲3鐡朵綑4涓绌虹摱銆備笁鐡跺枬瀹屽叡鏈7涓┖鐡躲傚啀鎹笁鐡舵按浣2绌虹摱銆傚枬瀹屾槸5涓┖鐡锛屽彲鍐嶆崲3鐡舵按銆傚叡鎹18鐡舵按浣3涓┖鐡躲傚2绌虹摱鍙崲3鐡舵按銆傚枬瀹屽悗杩樼摱浣1绌虹摱銆傚叡鎹21鐡舵按锛屼綑涓绌虹摱銆
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