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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.8*x = 88.2/x // - 88.2/x
1.8*x-(88.2/x) = 0
1.8*x-88.2*x^-1 = 0
1.8*x-88.2*x^-1 = 0
x^-1*(1.8*x^2-88.2) = 0
1.8*x^2 = 88.2 // : 1.8
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in { 7, -7 }
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