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初中数学试题常常有解方程(组)的类型,这类方程通常含有根式或分式。若平方去根号或去分母都会产生高次方程,很难解决。对这类方程,一定要认真观察,看看有没有一元二次方程的背景,然后用换元法来解。今以全国各地初中毕业、升学考试数学试题为例来说明。例1.解方程x2x2-3x+5√+
Junior mathematics test questions often have the type of solving equations (groups). Such equations usually contain radicals or fractions. If square roots or denominators result in higher order equations, it is difficult to solve. For such equations, it must be carefully observed to see if there is a background of a one-dimensional quadratic equation, and then use the substitution method to solve. Now take the example of mathematics examinations for junior high school graduation and entrance exams across the country as an example. Example 1. Solution equation x2x2-3x+5√+