ГДЗ по алгебре 7 класс Макарычев ФГОС Задание 892

\[\boxed{\text{892.}\text{\ }еуроки - ответы\ на\ пятёрку}\]

\[\textbf{а)}\ 8m(1 + 2m) - (4m + 3)(4m - 3) = 2m\]

\[8m + 16m^{2} - \left( 16m^{2} - 9 \right) - 2m = 0\]

\[8m + 16m^{2} - 16m^{2} + 9 - 2m = 0\]

\[6m = - 9\]

\[m = - \frac{3}{2}\]

\[m = - 1,5\]

\[Ответ:m = - 1,5.\]

\[\textbf{б)}\ x - 3x(1 - 12x) = 11 - (5 - 6x)(6x + 5)\]

\[x - 3x + 36x^{2} = 11 - \left( 25 - 36x^{2} \right)\]

\[- 2x + 36x^{2} = 11 - 25 + 36x^{2}\]

\[- 2x = - 14\]

\[x = 7\]

\[Ответ:x = 7.\]