номер 112 гдз 8 класс алгебра Муравин Муравин

1)\begin{equation}\left ( \frac{1}{2}c-d \right )^{7} \end{equation} \begin{equation}\frac{c^{7}}{128}-\frac{7c^{6}d}{64}+\frac{21c^{5}d^{2}}{32}- \end{equation} \begin{equation}-\frac{35c^{4}d^{3}}{16}+\frac{35c^{3}d^{4}}{8}-\frac{21c^{2}d^{5}}{4}+ \end{equation} \begin{equation}+\frac{7cd^{6}}{2}-d^{7} \end{equation} 2)\begin{equation}\left ( b-\frac{1}{b} \right )^{8} \end{equation} \begin{equation}b^{8}-8b^{6}+28b^{4}-56b^{2}+70- \end{equation} \begin{equation}-\frac{56}{b^{2}}+\frac{28}{b^{4}}-\frac{8}{b^{6}}+\frac{1}{b^{8}} \end{equation} 3)\begin{equation}\left ( x+\frac{1}{2x} \right )^{6} \end{equation} \begin{equation}x^{6}+6\cdot x^{5}\cdot \frac{1}{2x}+15x^{4}\cdot \left ( \frac{1}{2x} \right )^{2}+ \end{equation} \begin{equation}+20x^{3}\cdot \left ( \frac{1}{2x} \right )^{3}+15x^{2}\cdot \left ( \frac{1}{2x} \right )^{4}+ \end{equation} \begin{equation}+6x\cdot \left ( \frac{1}{2x} \right )^{5}+\left ( \frac{1}{2x} \right )^{6}= \end{equation} \begin{equation}=x^{6}+3x^{4}+\frac{15x^{4}}{4x^{2}}+20x^{3}\cdot \frac{1}{8x^{3}}+ \end{equation} \begin{equation}15x^{2}\cdot \frac{1}{16x^{4}}+6x\cdot \frac{1}{32x^{5}}+ \end{equation} \begin{equation}+\frac{1}{64x^{6}}=x^{6}+3x^{4}+\frac{15}{4}x^{2}+ \end{equation} \begin{equation}+\frac{5}{2}+\frac{15}{16x^{2}}+\frac{3}{16x^{4}}+\frac{1}{64x^{6}} \end{equation}