$-225-\left(48-22-15\right)+\left(-17+2\right)$
$\frac{15x+x^2+40}{15x+x^2+40}$
$\frac{5x^2y^2}{4xy^2}$
$5a^2-2bc-3d;\:a=2\:;\:\:b=5;\:\:c=3;\:d=1$
$\frac{-9x^2+x^4+x-3}{x+3}$
$k-4+2k-1$
$f\left(x\right)=-\frac{2x^2}{3}-1\left|0,3\right|$
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