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解二元一次方程组的关键是“消元”,其基本解法有代入消元法和加减消元法.这两种方法,都是从“消元”这个基本思想出发,先把“二元一次”转化为“一元一次”,再用一元一次方程的解法求出未知数的值.“消元”思想体现数学中“化未知为已知”和“化复杂为简单”的化归思想.消元法
The key to solving the binary system of equations is “elimination of the yuan”. The basic solution is substituted into the elimination method and the addition and subtraction elimination method. These two methods are based on the basic idea of “elimination of the yuan”. Once Yuan Yuan is converted to Yuan Yuan, the value of the unknown is determined by the solution of a one-dimensional first-order equation. The idea of “elimination Yuan” embodies the idea of “turning the unknown as known” and “transforming complex as simple” in mathematics. Elimination method