Выполните действия: (7 класс) а) (12ab-5a)-(ab+6a) б) (3y-2c)(y+6c) в) (с+1)(с(в...

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Выполните действия: (7 класс)

а) (12ab-5a)-(ab+6a)

б) (3y-2c)(y+6c)

в) (с+1)(с(во второй степени) +3с +2)

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Verified answer

1)
$\displaystyle (12ab-5a)-(ab+6a)=12ab-5a-ab-6a=12ab-ab-5a-6a=\\=11ab-11a=11(ab-a)$

2)
$\displaystyle (3y3c)(y+6c)=3y^2-2cy+18cy-12c^2=3y^2+16cy-12c^2$

3)
$\displaystyle (c+1)(c^2+3c+2)=c^3+c^2+3c^2+3c+2c+2=c^3+4c^2+5c+2$

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