dww381
幼苗
共回答了18个问题采纳率:94.4% 举报
特征方程 r² + 5 r + 6 = 0
特征解 r = -5/2 ± i /2
齐次方程通解 e^(-5t/2) [ C1 cos(t/2) + C2 sin(t/2) ]
非齐次方程特解设为 e^(-5t/2) [ u(t) cos(t/2) + v(t) sin(t/2) ]
原方程通解 y = e^(-5t/2) [ C1 cos(t/2) + C2 sin(t/2) ] + e^(-5t/2) [ u(t) cos(t/2) + v(t) sin(t/2) ]
1年前
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