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星期天,我和妈妈去超市买牙膏。我发现了同样的牙膏有两种不同包装:第一种牙膏:每盒120克,3盒共18元。第二种牙膏:每盒170克,一盒8元。妈妈问:“买哪种牙膏省钱呢?”我算了算,说:“第一种牙膏,1 8元买3盒,一盒的价钱是18÷3=6(元);第二种牙膏一盒8元,所以买第一种牙膏省钱。”妈妈听了我的回答,摇摇头,提醒我说:“你没有考虑牙膏的质量,把价钱和牙膏的质量联系起来,再思考一下!”我心想:第一种牙膏,6元买120克牙
On Sunday, my mom and I went to the supermarket to buy toothpaste. I found the same toothpaste in two different packages: The first toothpaste: 120 grams per box, 3 boxes a total of 18 yuan. The second toothpaste: 170 grams per box, a box of 8 yuan. My mother asked: “What kind of toothpaste to save money?” “I forget, said: ” The first toothpaste, 18 yuan to buy 3 boxes, a box of the price is 18 ÷ 3 = 6 (yuan); The second toothpaste box of 8 yuan, so buy the first toothpaste save money. “” Mom heard my answer, shook his head, reminded me that: Get up, think again! "I thought: the first toothpaste, 6 yuan to buy 120 grams of teeth