论文部分内容阅读
新编数学第一册(试验修正本)在研究一元二次不等式时,首先用图象法求解,再从因式分解出发,用转化法来求解。用转化法解二次不等式,一方面可为以后解比较复杂的不等式(如高次不等式)打下基础;另一方面转化法和图象法有互补的作用,可以发挥各自的特长,去解决综合性的问题。一、转化法的理论基础——符号法则1.如果ab>0,那么a、b应满足什么条件?ab<0呢?
When studying the second-order inequalities, the first book of mathematics (the experimental revision) first uses the image method to solve, and then proceeds from the factorization and uses the transformation method to solve. Using the transformation method to solve quadratic inequalities, on the one hand can lay the foundation for solving more complex inequalities (such as high-order inequalities); on the other hand, translation and image methods have complementary roles, and can exert their respective strengths to solve comprehensive problems. Sexual problems. First, the theoretical basis of the conversion method - the symbol rule 1. If ab> 0, then a, b should meet what conditions? ab <0?