数学题通常都有通用的解法(即称通法),例如:用全等法证明两三角形的对应边相等;用“⊿”法讨论二次方程有无实数根,等等。但有些题目用通法解往往过程冗繁或不易入手,甚至不能解决。对具体题目进行具体的分析、探索,揭示其特殊的数量关系或空间位置关系,往往 Math problems usually have a general solution (known as the general method), for example: using the congruent method to prove that the corresponding sides of the two triangles are equal; using the “⊿” method to discuss whether the quadratic equation has real roots, and so on. However, the use of common-law solutions for some topics is often tedious or difficult to handle, or even impossible to solve. Specific analysis and exploration of specific topics reveals their specific quantitative relationships or spatial relationships, often