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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)
9/x-1 = 18/(x^2)-1 // - 18/(x^2)-1
9/x-(18/(x^2))-1+1 = 0
9/x-18*x^-2-1+1 = 0
9*x^-1-18*x^-2 = 0
t_1 = x^-1
9*t_1^1-18*t_1^2 = 0
9*t_1-18*t_1^2 = 0
DELTA = 9^2-(-18*0*4)
DELTA = 81
DELTA > 0
t_1 = (81^(1/2)-9)/(-18*2) or t_1 = (-81^(1/2)-9)/(-18*2)
t_1 = 0 or t_1 = 1/2
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
t_1 = 1/2
x^-1-1/2 = 0
1*x^-1 = 1/2 // : 1
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x = 2
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