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数学课上,刘老师要同学们解决这样一个问题:有10盒零件,每盒有10个,其中有一盒零件是次品。正品每个零件有10克,次品每个零件9克。用什么办法只称一次就找出哪一盒是次品?同学们先独立思考寻找办法,然后进行了汇报,最后找到了巧妙的方法。刘锋第一个站起来说:“可用称一称的方法,把10盒零件平均分成几份来称,不能保证一次就称出次品零件,因此,我们可根据‘正品每个零件有10克,次品每个零件9克’这两个条件来解决问题。”
In math class, Teacher Liu wanted the students to solve such a problem: there are 10 boxes of parts, each box has 10, of which a box of parts is defective. Genuine 10 grams each part, defective parts 9 grams each. In what ways is it only once to find out which box is a defective product? Students first think independently of ways to find ways, and then reported on, and finally found a clever way. Liu Feng first stood up and said: “Available weighing method, the average of 10 parts divided into several parts can not be guaranteed once said inferior parts, so we can according to ’genuine each part has 10 grams, 9 grams each of defective parts’ these two conditions to solve the problem. ”