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任何一个数学命题都是由条件和结论两部分组成,一般地说,如果一个命题的条件改变了,那么它的结论就会发生变化.在学习过程中,对教材习题进行变式,改变命题的条件,引导学生猜想和判断新的结论,不仅能激发同学们的学习兴趣,而且还能掌握解决同类问题的规律,从而培养学生研究问题解决问题的能力,.现将九年义务教育教材《几何》第二册
Every mathematical proposition consists of two parts: the condition and the conclusion. Generally speaking, if the conditions of a proposition change, its conclusion will change. During the learning process, the textbook exercises are changed and the propositions are changed Conditions, and guide students to guess and determine new conclusions, not only can stimulate students ’interest in learning, but also to master the law to solve similar problems, so as to cultivate students’ ability to study problems to solve problems.Now the nine-year compulsory education textbook "Geometry Book two