номер 103 гдз 8 класс алгебра Муравин Муравин

1)\begin{equation}\frac{a}{x+y}+\frac{b}{x-y}-\frac{2by}{x^{2}-y^{2}} \end{equation}
при a = 1,45
b = 0,55
x = 1,2
y = 0,8 \begin{equation}\frac{ax-ay+bx+by-2by}{x^{2}-y^{2}}= \end{equation} \begin{equation}=\frac{ax-ay+bx-by}{x^{2}-y^{2}}= \end{equation} \begin{equation}=\frac{a\left ( x-y \right )+b\left ( x-y \right )}{x^{2}-y^{2}}= \end{equation} \begin{equation} =\frac{\left ( x-y \right )\left ( a+b \right )}{\left ( x+y \right )\left ( x-y \right )}= \end{equation} \begin{equation}=\frac{a+b}{x+y}=\frac{1,45+0,55}{1,2+0,8}=\frac{2}{2}=1 \end{equation} 2)\begin{equation}\frac{n}{a-b}+\frac{p}{a+b}+\frac{2bp}{a^{2}-b^{2}} \end{equation} при a = 7,25
b = 0,65
n = 9,3
p = -2,7 \begin{equation}\frac{an+bn+ap-bp+2bp}{a^{2}-b^{2}}= \end{equation} \begin{equation}=\frac{an+bn+ap+bp}{a^{2}-b^{2}}= \end{equation} \begin{equation}=\frac{n\left ( a+b \right )+p\left ( a+b \right )}{a^{2}-b^{2}}= \end{equation} \begin{equation}=\frac{\left ( a+b \right )\left ( n+p \right )}{\left ( a+b \right )\left ( a-b \right )}=\frac{n+p}{a-b}= \end{equation} \begin{equation}=\frac{9,3+\left ( -2,7 \right )}{7,25-0,65}=\frac{6,6}{6,6}=1 \end{equation}
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