Предмет: Алгебра, автор: kalugavera

2с(с-б)-(с-3)(с+3) выполните действия

Ответы

Автор ответа: Lesben

2c(c-b)-(c-3)(c+3)=2c²-2bc - (c²-9)=2c²-2bc-c²+9=c²-2bc+9

Автор ответа: Аноним

1) 2с ( с - б ) = 2с2 - 2сб
2) - ( с - 3 )•( с + 3 ) = - ( с2 - 9 ) = - с2 + 9
3) 2с2 - 2сб - с2 + 9 = с2 - 2сб + 9
Ответ с2 - 2сб + 9

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