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变式训练在教师的日常教学中成为了常态;各地中考题也在不断助力,使课改之花花繁叶茂,与时俱进.同学们学习等腰三角形知识点之后,会遇到如下面例1所求证的证明题,此题可以通过做辅助线用全等三角形和矩形的性质来证明两条线段之和等于第三条线段的长,也可以用面积法来证明,两种方法比较起来,用面积法证明显得更加简便.而把此题逐渐变式与创新,就会衍生出很多新颖的题目,下面从近年来各省市中考题中精选几例,供大家学习和复习时参考.
Variant training in the daily teaching of teachers has become the norm; around the examination questions are also constantly helping to make the lessons of the flower leafy, advancing with the times. Students learn isosceles triangle knowledge point, you will encounter the following Example 1 to prove the proof of title, this question can be done by supporting the use of congruent triangles and rectangles to prove that the sum of the two lines is equal to the length of the third line, you can also use the area method to prove that the two methods are compared Up, with the area method is more simple and convenient proof.And the gradual change and innovation of this question, it will be derived from many new topics, the following provinces and cities in recent years from a few selected in the examination questions for your reference and review .