$1,5\cdot2,8$
$\sqrt[3]{\frac{a^{11}}{a^2}}$
$\frac{e^{-2x}}{e^x}$
$x^2-2x+1=x^2-3x+x+1$
$3 \cdot ( 6 - 2 ) - 14$
$6+\left(-9\right)\left(-5\right)+\left(-4\right)\left(-3\right)+\left(-2\right)$
$\frac{d}{dx}xy\:\log x=1$
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