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解三元一次方程组的思想方法是消元,一般是经过三元化二元,再二元化一元.下面就讨论一下常见三元一次方程组的类型及解法.类型一方程组中三个方程都是三元一次方程.把方程组中一个方程与另两个方程分别组成两组方程组,消去两组方程组中的同一个未知数,得到关于另外两个未知数的二元一次方程组;解这个二元一次方程组,求出两个未知数的值,然后把这两个未知数的值代入原方程组中的任一一个方程,求出最后一个未知数的值.
Solution of ternary equations is the elimination of the idea, the general is through the ternary binary, then a dollar. Here to discuss the type of common ternary equations and solutions. Type of an equation in three The equation is a ternary one-time equation, one equation and the other two equations in the system form two sets of equations respectively, and the same unknowns in the two systems of equations are eliminated to obtain the system of binary equations about the other two unknowns; Solve this binary system of equations to find the values of two unknowns and substitute the values of the two unknowns into any of the equations in the original equations to find the value of the last unknowns.