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在数学里,字母能表示数,能表示运算律,能表示数学公式,能表示数学规律,能表示数量关系…… 一、字母能表示数 例1 填空: (1)某种大米的单价为2元/千克,购买n千克需付___元。 (2)小明上学步行的速度为5千米/时。若小明家到学校的路程为s千米,则他上学需走___小时;小明骑自行车的平均速度是步行的3倍,如果他上学骑自行车,需___小时;小明上学骑自行车比步行可以节省___小时。
In mathematics, letters can represent numbers, can represent the laws of operation, can represent mathematical formulas, can represent mathematical laws, and can represent quantitative relationships... 1. Letters can represent several examples1 Fill in the blanks: (1) The unit price of certain rice is 2 RMB/kg, you need to pay ___yuan to purchase n kg. (2) Xiao Ming went to school at a speed of 5 km/h. If Xiao Ming’s journey to school is s kilometers, he will need to walk ___ hours; Xiao Ming’s average speed of cycling is 3 times that of walking. If he goes to school to ride a bicycle, it takes ___ hours; Xiao Ming goes to school to ride a bicycle. It can save ___ hours compared to walking.