номер 74 гдз 8 класс алгебра Муравин Муравина

1)\begin{equation}\frac{3x+2y}{10c}+\frac{4x-y}{10c}-\frac{2x+y}{10c} \end{equation} \begin{equation}\frac{3x+2y+4x-y-2x-y}{10c}=\frac{5x}{10c}=\frac{x}{2c} \end{equation} 2) \begin{equation}\frac{5a-1}{14a}-\frac{7a-8}{14a}-\frac{9a+7}{14a} \end{equation} \begin{equation}\frac{5a-1-7a+8-9a-7}{14a}=\frac{11a}{14a}=\frac{11}{14} \end{equation} 3) \begin{equation}\frac{5c-7}{16c-8}+\frac{6c-1}{16c-8}-\frac{-c-2}{16c-8} \end{equation} \begin{equation}\frac{5c-7+6c-1+c+2}{16c-8}=\frac{12c-6}{16c-8}= \end{equation} \begin{equation}=\frac{6\left ( 2c-1 \right )}{8\left ( 2c-1 \right )}=\frac{3}{4} \end{equation} 4) \begin{equation}\frac{9y+4}{3y+6}-\frac{7y-16}{3y+6}+\frac{6y-4}{3y+6} \end{equation} \begin{equation}\frac{9y+4-7y+16+6y-4}{3y+6}=\frac{8y+16}{3y+6}= \end{equation} \begin{equation}=\frac{8\left ( y+2 \right )}{3\left ( y+2 \right )}=\frac{8}{3}=2\frac{2}{3} \end{equation}
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