求解一个一阶线性微分方程,请写出步骤。
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p' + [1/(x+1)]p = ln(x+1)/(x+1)
(x+1)p' + p =ln(x+1)
d/dx[ ( x+1) p] = ln(x+1)
( x+1) p = ∫ ln(x+1) dx
= xln(x+1) - ∫ [x/(x+1)] dx
= xln(x+1) - ∫ [1- 1/(x+1)] dx
=xln(x+1) - x +ln(x+1) + C
=(x+1)ln(x+1) - x + C
p = [(x+1)ln(x+1) - x + C]/(x+1)
(x+1)p' + p =ln(x+1)
d/dx[ ( x+1) p] = ln(x+1)
( x+1) p = ∫ ln(x+1) dx
= xln(x+1) - ∫ [x/(x+1)] dx
= xln(x+1) - ∫ [1- 1/(x+1)] dx
=xln(x+1) - x +ln(x+1) + C
=(x+1)ln(x+1) - x + C
p = [(x+1)ln(x+1) - x + C]/(x+1)
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