《中小学数学》(初中版)2008年第12期刊登的《一道“不起眼”的课本复习题引发的思考》,介绍了《数学》九年级下册101页复习题第6题,文中指出:情形3和情形4中,通过辅助线构造相似,得出对应比构成比例,解方程时用到了(A±2B~(1/2))~(1/2)型二次根式的化简,而化简工作显然超出了“课标”二次根式部分对学生 “Junior high school mathematics” (junior high school version) 2008 twelfth issue of “one ” humble “textbook review questions triggered”, introduced the “ninth grade” ninth grade 101 review questions sixth title, It is pointed out in the third and the fourth cases that the auxiliary structure is similar in structure, and the corresponding ratio is obtained. The quadratic form (A ± 2B ~ (1/2)) ~ (1/2) Simplifying, while simplifying the work obviously goes beyond the “class standard” of the secondary root part of the student