$\left(\:3^2\:-\:4\:\right)\:\cdot\:\left(-\:4\right)\:+\:2^2$
$x ^ { 3 } ( \frac { y } { x ^ { 2 } } ) ^ { - 2 }$
$\left(m+9\right)\left(m-4\right)$
$\left(-1.9\right)+\left(-0.9\right)$
$x^2+4x=13$
$0,1246-0,24$
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