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yy'+xe^y=0
x只有一个,将x看成y的函数,y'=1/x'
y/x'+xe^y=0
y=-xx'e^y
xx'=-ye^(-y)
积分:
(1/2)x²=-∫ye^(-y)dy
=∫yde^(-y)
=ye^(-y)-∫e^(-y)dy
(1/2)x²=ye^(-y)+e^(-y)+C
x=1,y=0代入:
1/2=1+C,C=-1/2
(1/2)x²=ye^(-y)+e^(-y)-1/2
x²=2ye^(-y)+2e^(-y)-1=2(y+1)e^(-y)-1
x只有一个,将x看成y的函数,y'=1/x'
y/x'+xe^y=0
y=-xx'e^y
xx'=-ye^(-y)
积分:
(1/2)x²=-∫ye^(-y)dy
=∫yde^(-y)
=ye^(-y)-∫e^(-y)dy
(1/2)x²=ye^(-y)+e^(-y)+C
x=1,y=0代入:
1/2=1+C,C=-1/2
(1/2)x²=ye^(-y)+e^(-y)-1/2
x²=2ye^(-y)+2e^(-y)-1=2(y+1)e^(-y)-1
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