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D( b )
b^-2 = 0
b = 0
b^-2 = 0
b^-2 = 0
1*b^-2 = 0 // : 1
b^-2 = 0
b naleu017Cy do O
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(10*b^6)/(b^-2)+5*b^3 = 0
10*b^8+5*b^3 = 0
5*b^3*(2*b^5+1) = 0
2*b^5 = -1 // : 2
b^5 = -1/2
b^5 = -1/2 // ^ 1/5
b = -(1/2)^(1/5)
5*b^3 = 0
5*b^3 = 0 // : 5
b^3 = 0
b = 0
b in { 0}
b = -(1/2)^(1/5)
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