问题描述: y''-y=x求通解 1个回答 分类:数学 2014-10-02 问题解答: 我来补答 特征方程r² - 1 = 0 r = ±1 y1 = c1*e^x y2 = c2*e^(-x) 设特解yp = ax + b yp' = a,yp'' = 0,代入方程 0 - (ax + b) = x -a = 1 => a = -1 b = 0 yp = -x 通解为y = y1 + y2 + yp 即y = c1*e^x + c2*e^(-x) - xcopy的, 展开全文阅读