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常數變易法:解一階非齊次線性微分方程dy/dx+p(x)y=q(x)[q(x)≠0]的時候先令q(x)=0,解出對應的一階齊次線性微分方程的通解y=Ce^(-∫p(x)dx);然後再把這個通解中的C換為u(x),再把做過變換的通解帶入原方程解出u(x);於…
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