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在解题时,过程、结论貌似正确,实质上却是错解的情况时常发生,究其原因,是因为题目所提供的条件在数值及式子结构等方面的关系比较微妙、隐蔽.因而,在解题中,若能对题目中的隐性条件深入挖掘,逐一剖析,必能撩开其神秘的面纱,出奇制胜解题.一、挖掘二次函数中的隐含条件——忽视二次项系数能否为0的情形二次函数是高中阶段的重点,也是难点,其中在含参数问题中,二次函数是否为0的问题是学生比较容易忽视的,我们只要善于挖掘这个隐含条件,就能避免出错,提高解题技巧.
The reason why the process and the conclusion appear to be correct when the problem is solved and the problem is actually the wrong one is because the conditions provided by the title are subtle and hidden in terms of the numerical and the sub-structure, etc. Therefore, In the problem solving, if the hidden conditions of the topic in-depth mining, one by one analysis, will be able to put aside its mysterious veil, surprisingly solve the problem.A mining quadratic function of the implied conditions - neglect quadratic terms Whether the coefficient can be 0 or not is a high school stage secondary function is the key, but also difficult, including the parameter problems, the quadratic function is 0 is easier for students to ignore the problem, we only good at mining this implied conditions, Can avoid mistakes, improve problem solving skills.