$-\frac{2x\left(y-x\left(-\frac{x^2}{y^2}\right)\right)}{y^3}$
$\left(3+5\right)+x$
$3x^224x+45$
$x+\frac{1}{x}=\sqrt{5}$
$\frac{x^2+9x+18}{x+6}$
$6,3cm+2,4cm+2,1cm+2,7cm+2,8cm+2,6cm$
$x^2-17x+52$
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