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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
0.8*x^0.5*((0.5*5*x^-0.5*y^0.8)/5)*y^-0.2 = 0
0.4*y^0.6 = 0
x należy do R
x in (0:+oo)
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