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- [math]\frac{a-2b}{a^2-4b^2}\cdot\frac{a+2b}{b^2-10a^2}[/math][math]=\frac{\left(a-2b\right)\left(a+2b\right)}{(a^2-4b^2)(b^2-10a^2)}=\frac{(a^2-4b^2). [math]\frac1{b^2-10a^2}=\frac1{8^2-10\left(\sqrt6\right)^2}=\frac1{64-60}=0,25[/math]
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