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D( x )
x < 0
x < 0
x in <0:+oo)
(3*x)/5-(0.5*x^1.9) = 0
(3*x)/5-0.5*x^1.9 = 0
3/5*x-0.5*x^1.9 = 0
x*(3/5-0.5*x^0.9) = 0
-0.5*x^0.9 = -3/5 // : -0.5
x^0.9 = 1.2
( 1.2 < 0 i 0.9 in (0:1) ) => x należy do O
x = 0
x = 0
x = 0
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