Question

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Answer 1

Ответ:

$\frac{t {}^{2} }{t - 9} - \frac{18t - 81}{t - 9} = \frac{t {}^{2} - (18t - 81) }{t - 9} = \frac{t {}^{2} - 18t + 81 }{t - 9} = \frac{(t - 9) {}^{2} }{t - 9} = t - 9$

Answer 2

Ответ:

Смотри...................