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D( x )
-28*x^2*y^4 = 0
-28*x^2*y^4 = 0
-28*x^2*y^4 = 0
-28*x^2*y^4 = 0 // : -28*y^4
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(140*x^2*y^3)/(-28*x^2*y^4) = 0
-5*y^-1 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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