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D( z )
z < 0
z = 0
z < 0
z = 0
z = 0
z in (0:+oo)
3*z^(-1/4)*(6*z^7-z^(1/4)) = 0
6*z^7-z^(1/4) = 0
z^(1/4)*(6*z^(27/4)-1) = 0
6*z^(27/4) = 1 // : 6
z^(27/4) = 1/6
z^(27/4) = 1/6 // ^ 4
z^27 = 1/1296 // ^ 1/27
z = (1/1296)^(1/27)
z^(1/4)*(z-(1/1296)^(1/27)) = 0
3*z^(-1/4)*z^(1/4)*(z-(1/1296)^(1/27)) = 0
( 3*z^(-1/4) )
3*z^(-1/4) = 0 // : 3
z^(-1/4) = 0
z należy do O
( z-(1/1296)^(1/27) )
z-(1/1296)^(1/27) = 0 // + (1/1296)^(1/27)
z = (1/1296)^(1/27)
( z^(1/4) )
1*z^(1/4) = 0 // : 1
z^(1/4) = 0
z = 0
z in { 0}
z = (1/1296)^(1/27)
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