Ответ:2b/2b+c - 4b^2/4b^2+4bc+c^2=2b/2b+c - 4b^2/(2b+c)^2=2b-4b^2/2b+c
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Ответ:2b/2b+c - 4b^2/4b^2+4bc+c^2=2b/2b+c - 4b^2/(2b+c)^2=2b-4b^2/2b+c