$\left(\sqrt{6}x+\sqrt{2}x\right)\left(\sqrt{6}y-\sqrt{2}y\right)$
$0.25+1.75$
$-x^2+7x+8$
$k^2-4k+13=0$
$\frac{25x^2-30x+9}{x+5}$
$\left(1+\frac{1}{2n}\right)^{3n}$
$\frac{x+6}{x-4}=\frac{1}{x-1}$
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