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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x^(-1/3)*(x-5) = 0
2/3*x^(-1/3)*(x-5) = 0
( 2/3*x^(-1/3) )
2/3*x^(-1/3) = 0 // : 2/3
x^(-1/3) = 0
x należy do O
( x-5 )
x-5 = 0 // + 5
x = 5
x = 5
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