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D( b )
(b^2)^5 = 0
(b^2)^5 = 0
(b^2)^5 = 0
1*b^10 = 0 // : 1
b^10 = 0
b = 0
b in (-oo:0) U (0:+oo)
((b^3)^7)/((b^2)^5) = b^11 // - b^11
((b^3)^7)/((b^2)^5)-b^11 = 0
0 = 0
b należy do R
b in (-oo:0) U (0:+oo)
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