某城市为了鼓励节约用水,对自来水用户采取如下收费标准:若每户每月用水不超过12吨,按每吨1.8元收费;若超过12吨,则超过部分按每吨3.6元收费,小斌家上月交了50.4元水费,问小斌家上个月用
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![某城市为了鼓励节约用水,对自来水用户采取如下收费标准:若每户每月用水不超过12吨,按每吨1.8元收费;若超过12吨,则超过部分按每吨3.6元收费,小斌家上月交了50.4元水费,问小斌家上个月用](/uploads/image/z/2213046-54-6.jpg?t=%E6%9F%90%E5%9F%8E%E5%B8%82%E4%B8%BA%E4%BA%86%E9%BC%93%E5%8A%B1%E8%8A%82%E7%BA%A6%E7%94%A8%E6%B0%B4%2C%E5%AF%B9%E8%87%AA%E6%9D%A5%E6%B0%B4%E7%94%A8%E6%88%B7%E9%87%87%E5%8F%96%E5%A6%82%E4%B8%8B%E6%94%B6%E8%B4%B9%E6%A0%87%E5%87%86%EF%BC%9A%E8%8B%A5%E6%AF%8F%E6%88%B7%E6%AF%8F%E6%9C%88%E7%94%A8%E6%B0%B4%E4%B8%8D%E8%B6%85%E8%BF%8712%E5%90%A8%2C%E6%8C%89%E6%AF%8F%E5%90%A81.8%E5%85%83%E6%94%B6%E8%B4%B9%EF%BC%9B%E8%8B%A5%E8%B6%85%E8%BF%8712%E5%90%A8%2C%E5%88%99%E8%B6%85%E8%BF%87%E9%83%A8%E5%88%86%E6%8C%89%E6%AF%8F%E5%90%A83.6%E5%85%83%E6%94%B6%E8%B4%B9%2C%E5%B0%8F%E6%96%8C%E5%AE%B6%E4%B8%8A%E6%9C%88%E4%BA%A4%E4%BA%8650.4%E5%85%83%E6%B0%B4%E8%B4%B9%2C%E9%97%AE%E5%B0%8F%E6%96%8C%E5%AE%B6%E4%B8%8A%E4%B8%AA%E6%9C%88%E7%94%A8)
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