$\left(x-60\right)^2$
$ab^2c+a^2b^3c^2+a^3bc^3$
$\frac{xy+3y}{4x+12}$
$\frac{x}{\left(1+x\right)^2}$
$2,50+2,50+15,00$
$u^2+4u-5=0$
$\frac{5x^3-3x^2+x}{5-x}$
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