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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x+6/(x^2) = 0
10*x^-1+6*x^-2 = 0
t_1 = x^-1
6*t_1^2+10*t_1^1 = 0
6*t_1^2+10*t_1 = 0
DELTA = 10^2-(0*4*6)
DELTA = 100
DELTA > 0
t_1 = (100^(1/2)-10)/(2*6) or t_1 = (-100^(1/2)-10)/(2*6)
t_1 = 0 or t_1 = -5/3
t_1 = -5/3
x^-1+5/3 = 0
1*x^-1 = -5/3 // : 1
x^-1 = -5/3
-1 < 0
1/(x^1) = -5/3 // * x^1
1 = -5/3*x^1 // : -5/3
-3/5 = x^1
x = -3/5
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = -3/5
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