Раскройте круглые скобки . (a+b+c)(a²+b²+c²-ab-ac-bc) 

а) a³+b³+c³

б) a³+b³+c³-3abc

в) a³+b³+c³-a² b-b² c-c² a

г) a³+b³+c³-2a² b-2b² c-2c² a

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