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比例线段是勾通代数与几何计算的桥梁.在处理比例线段的问题时,时常出现各种各样的错误,现对学习过程中常犯的错误进行剖析,供你学习时参考.错点一忽视单位的统一或单位换算出错例1 A、B两地的实际距离AB=5km,画在纸上的距离A忆B忆=5cm,求纸上距离与实际距离的比.错解1:纸上距离与实际距离的比是A忆B忆∶AB=5∶5=1∶1.错解2:5km=50 000cm,纸上距离与实际距离的比是A忆B忆∶AB=5∶50 000=1∶10 000.
Proportional line segment is a bridge between algebra and geometric calculation .When dealing with the problem of proportional line, a variety of errors often appear, the learning process often make mistakes are analyzed for your reference when learning. Of the unity or unit conversion error A 1, B, the actual distance between the two AB = 5km, the distance drawn on the paper A memory B = 5cm, seeking the distance between the paper and the actual distance ratio wrong 1: paper distance The ratio of the distance to the actual distance is A: B = 5: 5 = 1: 1. Wrong 2: 5km = 50 000cm, the ratio of paper distance to actual distance is A: B = 5:50 000 = 1: 10,000.