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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
20*x-(160/(x^2)) = 0
20*x-160*x^-2 = 0
20*x^1-160*x^-2 = 0
(20*x^3-160*x^0)/(x^2) = 0 // * x^4
x^2*(20*x^3-160*x^0) = 0
x^2
20*x^3-160 = 0
{ 1, -1, 2, -2, 4, -4, 5, -5, 8, -8, 10, -10, 16, -16, 20, -20, 32, -32, 40, -40, 80, -80, 160, -160 }
1
x = 1
20*x^3-160 = -140
1
-1
x = -1
20*x^3-160 = -180
-1
2
x = 2
20*x^3-160 = 0
2
x-2
20*x^2+40*x+80
20*x^3-160
x-2
40*x^2-20*x^3
40*x^2-160
80*x-40*x^2
80*x-160
160-80*x
0
20*x^2+40*x+80 = 0
DELTA = 40^2-(4*20*80)
DELTA = -4800
DELTA < 0
x in { 2}
x = 2
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