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1.题目:已知点0是△ABC所在平面上一点,且OA+2OB+3OC=0,则△BOC与△AOB的面积比为__.这是我校高一年级期中考试卷上的一道试题,难度系数0.55.对于高一年级来讲,本题有一定的难度,考查学生的数形结合、转化与化归等数学思想.师:大家说说看,你在做这道题时,首先想到什么?生(众):画图.师:很好!向量是一个既具备代数属性,又具备几何属性的量.我们在研究向量问题时,可以结合图形研究.那么你是怎么画图的呢?谁能到黑板上给大家讲讲吗?看来大家有不少想法嘛!今天老师也做一回
1. Topic: Knowing that point 0 is the point where △ ABC is on, and OA + 2OB + 3OC = 0, then the area ratio of △ BOC to △ AOB is __. This is the first grade in my school exam papers A test, the difficulty coefficient of 0.55. For the first year of high grade, the problem has a certain degree of difficulty, examine the students with the number of forms, transformation and transformation to mathematical thinking. Teacher: Everyone talk about, you are doing this problem, Teacher: Well! Vector is a quantity that has both algebraic and geometric properties. When we study vectorial problems, we can combine the research of graphics. So how did you draw it? Who can talk to everyone on the blackboard? It seems that we have a lot of ideas! Today, teachers do a back