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y'-y = y^2
dy-ydx=y^2dx
除y^2
y^-2dy - y^-1dx = dx
令u= y^1-2 =y^-1
du = (1-2)y^-2dy
-du-udx = dx
du+udx = -dx
(D+1)u = -1
u = c1e^-x
h
u = (1-D)(-1)
p
= -1
1/y = c1e^-x-1
y=(c1e^-x-1)^-1
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