论文部分内容阅读
一、有一个未知数的系数相差1的例1 解方程组4x+7y=222① 5x+6y=217② (课本P_(31)) 特点:x(或y)的系数相差1。简解:②-①得
First, there is a case where the coefficients of the unknowns differ by one. Example 1 Solution Equations 4x+7y=2221 5x+6y=2172 (Textbook P_(31)) Characteristics: The coefficient of x (or y) differs by one. Simple Explanation: 2-1