$2.1\cdot8.2$
$\left(1+x^2\right)y'-xy=2x$
$n2-5n+10n-10$
$\left(\sqrt[2]{\frac{a}{2}}-\sqrt[2]{2a}\right)\left(\sqrt[2]{\frac{a}{2}}-\sqrt[2]{2a}\right)$
$7x^2+21x-28=\:0$
$5x^2-6x+2x-2$
$400a^2\:-\:256b^2$
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