номер 73 гдз 8 класс алгебра Муравин Муравина

1)\begin{equation}\frac{\left ( a+b \right )^{2}}{ab}-\frac{\left ( a-b \right )^{2}}{ab}=4 \end{equation} \begin{equation}\frac{a^{2}+2ab+b^{2}-a^{2}+2ab-b^{2}}{ab}=\frac{4ab}{ab} \end{equation}
4 = 4
2)\begin{equation}\frac{\left ( a+b \right )^{2}}{a^{2}+b^{2}}+\frac{\left ( a-b \right )^{2}}{a^{2}+b^{2}}=2 \end{equation} \begin{equation}\frac{a^{2}+2ab+b^{2}+a^{2}-2ab+b^{2}}{a^{2}+b^{2}}= \end{equation} \begin{equation}=\frac{2a^{2}+2b^{2}}{a^{2}+b^{2}}=\frac{2\left ( a^{2}+b^{2} \right )}{a^{2}+b^{2}}=2 \end{equation}
2 = 2
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