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统编高中教材(乙种本)第63页“运动物体在某一时刻的即时速度的大小,叫做即时速率,简称速率”。笔者对此说法有不同看法。一、我认为把即时速度人小叫做即时速率,这说法不妥。我们知道:即时速度表示质点在某一时刻或通过某一位置时的速度,即当所取的时间间隔越来越小——越近于零时,相应的平均速度就趋近甘露醇固定数值,这个数值叫做AT趋近于零时平均速度的极限值。这个极限值就是运动物体极限值就是运动物体的即时速度。
Unified high school textbooks (Type B) Page 63 “The instantaneous speed of a moving object at a certain time, called the instantaneous rate, referred to as rate ”. The author has different opinions on this argument. First, I think it is wrong to call real-time speed people instant rates. We know that the instantaneous velocity represents the velocity of a particle at a certain time or through a certain position, that is, when the time interval taken is getting smaller and smaller—the closer to zero, the corresponding average velocity approaches the mannitol fixed value, This value is called the limit value of the average speed when the AT approaches zero. This limit is the limit value of the moving object is the instantaneous speed of the moving object.