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在教学北师大版数学七年级(下册)《相交线与平行线》一章时,我们备课组对课本上的一道习题有过争论,存在着分歧.问题(北师大版数学七年级(下册)课本54页的问题解决)如下:林湾乡要修建一条灌溉水渠,如图,水渠从A村沿北偏东65°方向到B村,从B村沿北偏西25°方向到C村,水渠从C村沿什么方向修建,可以保持与AB的方向一致?相配套的教师用书中,给
In the teaching of Beijing Normal University version of Mathematics seventh grade (second volumes) “intersecting lines and parallel lines,” a chapter, our lesson preparation class textbooks on a controversy, there are differences. Problem (Beijing Normal University Mathematics grade seven (Volume 2)) is as follows: An irrigation canal should be constructed in Linwan Township. As shown in the figure, the drainage canal runs from A village to the village of B at a distance of 65 ° from east to north and 25 ° north to west from B village To C village, drains from the C village along the direction of construction, can maintain the same direction with the AB? Matching the teacher’s book, give