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公式是這樣的:如果要求的是y的導數+ p(x)y=q(x) 這一題就是把-3/x看為p(x)把等號右面的“x的3次方e的x次方”看為q(x) 公式如下: y = e的(-∫p(x)dx)次方乘以[∫p(x)q(x)dx + C] C是任意常數
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