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D( x )
(x^5)/5 < 0
x = 0
(x^5)/5 < 0
(x^5)/5 < 0
1/5*x^5 < 0
1/5*x^5 < 0 // : 1/5
x^5 < 0/1/5
x^5 < 0
x^5 < 0 // ^ 1/5
x < 0
x in (-oo:0)
x = 0
x = 0
x in (0:+oo)
((((x^5)/5)^(1/4))/x)*x^5 = 16 // - 16
((((x^5)/5)^(1/4))/x)*x^5-16 = 0
(1/5)^(1/4)*x^(21/4) = 16 // : (1/5)^(1/4)
x^(21/4) = 16/((1/5)^(1/4))
x^(21/4) = 16/((1/5)^(1/4)) // ^ 4
x^21 = 327680 // ^ 1/21
x = 327680^(1/21)
x = 327680^(1/21)
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