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在初中数学中有这样一类方程:即未知数的个数多于方程的个数,这类方程用常规方法是不能求解的,必须根据特点,运用技巧,才能达到解题目的.本文介绍几种方法,供初中同学参考.一、巧用非负数的性质关于非负数应理解两点:(1)非负数,即不是负数,它包括正数和零.在初中常表示为完全平方式或算术平方根.(2)非负数有如下性质:若几个非负数的和等于0,则必须每个都等于0.利用这个性质可把多元方程转化为低一次的方程.
In junior high school mathematics, there is such a kind of equation: the number of unknowns is more than the number of equations. Such equations can not be solved by the conventional method. Therefore, we must use the skills according to the characteristics to solve the problem. Method, for junior high school classmates reference .One, the use of non-negative nature of the non-negative on the number of non-negative should understand two points: (1) non-negative, that is not negative, which includes positive and zero .In junior high school often expressed as a complete flat or arithmetic Square root. (2) Non-negative numbers have the following properties: If the sum of several non-negative numbers equals 0, then each must be equal to 0. This property allows the multivariate equation to be transformed into a lower-order equation.