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数学学习强调经历学习过程,注重学习的探究与合作.一题多解、一题多证能够很好地体现学生在学习过程中的自主探究,有利于培养学生思维的广阔性.现对2015年高考全国新课标2理科第20题给出两种不同于参考答案的解法,供大家参考.原题已知椭圆C:9x~2+y~2=m~2(m>0),直线l不过原点O且不平行于坐标轴,l与C有两个交点A、B,线段AB的中点为M.
Mathematics learning emphasizes experiencing the process of learning, focusing on learning to explore and cooperation .A multi-solution, a question and more evidence can well reflect the students in the learning process of self-exploration, is conducive to cultivating the broad thinking of students. The new college entrance examination 2 science subjects 20 gives two different solutions to the reference answer for your reference. The original title known oval C: 9x ~ 2 + y ~ 2 = m ~ 2 (m> 0), the straight line l However, the origin O and not parallel to the axis, l and C have two intersection points A, B, the midpoint of the line segment AB is M.