(x^2)dy+(y^2)dx=dx-dy
问题描述:
(x^2)dy+(y^2)dx=dx-dy
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