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因式分解是初中代数的重要内容,因其分解方法较多,题型变化较大,学生感到不易掌握,教学有一定难度。转化思想是数学的重要解题思想,笔者在这章教学中在要求学生掌握好基本分解方法的同时,突出引导“转化”,使学生对这种灵活性较大的题型有章可循,易于入手,收到较好的效果。 因式分解的基本方法是:提取公因式法、公式法、十字相乘法。要求学生很好掌握,并认真分析其特点和使用条件。强调提取公因式法适用于整个多项式.公式法中的
Factorization is an important content of junior high school algebra, because of its many methods of decomposition, changes in the type of questions, students feel difficult to grasp, teaching has a certain degree of difficulty. The idea of transformation is an important problem-solving idea for mathematics. In this chapter of the teaching, students are required to master basic disintegration methods while highlighting and guiding “transformation” so that students can follow rules with this type of flexibility. Easy to start and receive good results. The basic method of factorization is: extraction of common factor method, formula method, cross multiplication method. Students are required to master it well and analyze their characteristics and conditions of use. Emphasize that the extraction of the common factor method applies to the entire polynomial.