Ответ:
[tex]9n^{2} - 9n \\ 9n \times n - 1 \div 18 = n \times (n - 1) \div 2 = \\ \frac{1}{2} n \times (n - 1) \\ 9n^{2} - 9n[/tex]
Доказано
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Ответ:
[tex]9n^{2} - 9n \\ 9n \times n - 1 \div 18 = n \times (n - 1) \div 2 = \\ \frac{1}{2} n \times (n - 1) \\ 9n^{2} - 9n[/tex]
Доказано