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对于“两条直线被一组平行线所截,所得的对应线段成比例”这部分内容,新课标提出的要求是掌握基本事实,人民教育出版社出版的教科书(2014年10月第1版)是这样编写的:探究如图1,任意画两直线l1,l2,再画三条与l1,l2都相交的平行线l3,l4,l5.分别度量l3,l4,l5在l1上截得的线段AB,BC和在l2上截得的线段AB,BC和在l2上截得的两条线段DE,
For the “two straight lines are a set of parallel lines cut off, the resulting line is proportional to the proportion of” part of the requirements of the new course standard is to grasp the basic facts, People’s Education Publishing House published textbooks (October 2014 1 version) is written as follows: Explore Figure 1, arbitrarily draw the two lines l1, l2, then draw three and l1, l2 are intersecting the parallel lines l3, l4, l5 respectively measure l3, l4, l5 cut in l1 The line segments AB, BC, and the line segments AB, BC taken at l2 and the two line segments DE taken at l2,