Автор - nastiadudina57

Помоните с 4 пожалуйста!!!

Ответ

Автор - googa19

Ответ:

=

 frac{ {3a}^{2} + 6 - 3a - 3 -  {a} ^{2}  + a  - 1 }{(a + 1)( {a}^{2} - a + 1) }

=

 frac{ 2 {a}^{2} - 2a + 2  }{(a + 1)( {a}^{2} - a + 1) }

=

 frac{ 2( {a}^{2} - a + 1)  }{(a + 1)( {a}^{2} - a + 1) }

=

 frac{2}{a + 1}

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