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D( X )
X < 0
X < 0
X in <0:+oo)
X^(1/2)-3^(1/3)-3^(1/6) = -9 // + 9
X^(1/2)-3^(1/3)-3^(1/6)+9 = 0
1*X^(1/2) = -(9-3^(1/6)-3^(1/3)) // : 1
X^(1/2) = -(9-3^(1/6)-3^(1/3))
( -(9-3^(1/6)-3^(1/3)) < 0 i 1/2 in (0:1) ) => X należy do O
X belongs to the empty set
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