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y'-y=xe^(2x) e^(-x)(y'-y)=xe^x (e^(-x)y)'=xe^x 兩邊積分:e^(-x)y=∫xe^xdx=∫xd(e^x)=xe^x-∫e^xdx=xe^x-e^x+C y=(x-1)e^(2x)+C
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