(x^2+1)dy/dx+2xy=4x^2
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求方程(x*x+1)dy/dx+2xy=4x*x的通解.
dy/dx=1+x+y^2+xy^2
(1-x^2)dy/dx+xy=1
解方程dy/dx+2xy=4x...
x^2+xy+y^3=1,求dy/dx
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(x^2+1)dy/dx+2xy=4x^2
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