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待定系数法——一种求未知数的方法.使用待定系数法解题的一般步骤是:(1)确定所求问题含待定系数的一般解析式;(2)根据恒等条件,列出一组含待定系数的方程;(3)解方程或消去待定系数,从而使问题得到解决.每份中考卷都有对待定系数法的考查要求,下面以两道考题为例,辅导讲解.例1(2014·江苏无锡)在直角坐标系中,一直线a向下平移3个单位后所得直线b经过点A(0,3),将直线b绕点A顺时针
To be determined coefficient method - a method of finding unknown. The use of undetermined coefficient method to solve the general steps are: (1) to determine the problem to be determined with the coefficient of the general analytical formula; (2) according to the conditions of equality, a group Including the equation to be determined coefficient; (3) solution equation or eliminate the coefficient to be determined, so that the problem is solved .Each test paper has to be determined coefficient method test requirements, the following two exam questions, for example. 2014 · Wuxi, Jiangsu Province) In a Cartesian coordinate system, a straight line a is translated downward by 3 units and a straight line b passes through point A (0, 3)