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两个名数相乘或者相除(比),得到一个新的名数。这个新名数的计量单位,叫做量的合成单位。在部编五年制小学数学教材中,只介绍了面积和体积这两类量的合成单位,比如平方米、立方米。教材为了不加重学生的负担,其他一些量的合成单位采取回避的手法,留待以后学习。因此,教学中难免引起某些质疑。例如: ①“两地相距74里,甲乙两人同时从两地相向而行,4小时后相遇,已知甲的速度是每小时8里,求乙的速度。”学生计算后,答道:“乙的速度是10.5里。”这种答法对不对?
Multiply or divide the two names (ratio), get a new name. The new name of the unit of measurement, called the amount of units of synthesis. In part-time five-year primary school mathematics textbooks, only introduced the area and volume of these two types of synthetic units, such as square meters, cubic meters. In order not to exaggerate the burden on students, some other units will take the approach of avoiding and will be left to study later. Therefore, the teaching will inevitably cause some questions. For example: ① “Distance between the two places 74, A and B both at the same time from the two places, 4 hours after the encounter, known speed of A is 8 miles per hour, the speed of B.” After the calculation of the students, replied: “The speed of B is 10.5.” This answer is correct?