求解第一大题
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(1)3x^2+12x^3*y+3x^4*y'-2y^2-4xyy'=0
y'=(2y^2-3x^2-12x^3*y)/(3x^4-4xy)
(2)y'=cos(y/x)*(y'x-y)/x^2
x^2*y'=cos(y/x)*y'x-cos(y/x)*y
y'=[cos(y/x)*y]/[cos(y/x)*x-x^2]
(3)e^(xy)*(y+xy')+y'*lnx+y/x=2cos2x
y'=[2cos2x-y/x-e^(xy)*y]/[e^(xy)*x+lnx]
(4)y+xy'=e^(x+y)*(1+y')
y'=[e^(x+y)-y]/[x-e^(x+y)]
(5)y'=e^y+xe^y*y'
y'=(e^y)/(1-xe^y)
y'=(2y^2-3x^2-12x^3*y)/(3x^4-4xy)
(2)y'=cos(y/x)*(y'x-y)/x^2
x^2*y'=cos(y/x)*y'x-cos(y/x)*y
y'=[cos(y/x)*y]/[cos(y/x)*x-x^2]
(3)e^(xy)*(y+xy')+y'*lnx+y/x=2cos2x
y'=[2cos2x-y/x-e^(xy)*y]/[e^(xy)*x+lnx]
(4)y+xy'=e^(x+y)*(1+y')
y'=[e^(x+y)-y]/[x-e^(x+y)]
(5)y'=e^y+xe^y*y'
y'=(e^y)/(1-xe^y)
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