Выражение: а) (с+8)(с--3)²; б) (а-б)²+8аб; в) (5х)(25+10х+х²)+х³
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20.09.2019 09:00
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б) (а-б)²+8аб=а²+б²-2аб+8аб=а²+б²+6аб
в) (5-х)(25+10х+х²)+х³=5³-х³+х³=5³=125