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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2*(50/x-(x/2)) = 0
x^2*(50*x^-1-1/2*x) = 0
50*x^-1-1/2*x = 0
x^-1*(50-1/2*x^2) = 0
-1/2*x^2 = -50 // : -1/2
x^2 = 100
x^2 = 100 // ^ 1/2
abs(x) = 10
x = 10 or x = -10
x^-1*(x-10)*(x+10) = 0
x^-1*x^2*(x-10)*(x+10) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-10 )
x-10 = 0 // + 10
x = 10
( x^-1 )
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x in { -10, 10 }
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