Автор - AnnyGav

(b+c)(b-c) - b (b-2c)

Ответ

Автор - sedakareni
(b+c)(b-c) -b (b-2c) = b^2-bc+cb-c^2-b^2+2cb=-c^2+2cb

Ответ

Автор - jamilyadayanovn
,.......... б²-с²-б²-2сб

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