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D( x )
x = 0
1/x = 0
x = 0
x = 0
1/x = 0
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
8.5/(1/x) = 51 // - 51
8.5/(1/x)-51 = 0
8.5*x-51 = 0 // + 51
8.5*x = 51 // : 8.5
x = 51/8.5
x = 6
x = 6
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