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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((10/9)*x^-1)/3-(((10/9)*x^-4)/3) = 0
((10/9)*x^-1)/3+(-10/27)*x^-4 = 0
10/27*x^-1-10/27*x^-4 = 0
t_1 = x^-1
10/27*t_1^1-10/27*t_1^4 = 0
10/27*t_1-10/27*t_1^4 = 0
10/27*t_1*(1-t_1^3) = 0
-1*t_1^3 = -1 // : -1
t_1^3 = 1
t_1^3 = 1 // ^ 1/3
t_1 = 1
(10*t_1)/27 = 0
10/27*t_1 = 0 // : 10/27
t_1 = 0
t_1 = 1
x^-1-1 = 0
1*x^-1 = 1 // : 1
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = 1
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