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数学
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(x^2)dy+(y^2)dx=dx-dy
人气:230 ℃ 时间:2020-04-11 06:34:44
解答
(x^2+1)dy=(1-y^2)dx dy/(1-y)(1+y)=dx/(x^2+1) 1/2lnl(y-1)/(y+1)l=arctanx+c在帮我一个,我给再加五分,y′=y,y(0)=1.谢谢了dy/y=dxlny=x+c1y=ce^x y(0)=1得c=1y=e^x
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