$100^2-140+49$
$\frac{-28}{-1}$
$4\cdot\left(-1\right)^3\cdot\left(2\right)+3\cdot\left(2\right)^2\cdot\left(-1\right)^6$
$ln\left(x\cdot y\right)dx+\left(\frac{x}{y}\right)dy=0$
$3-\left[-2-5-3\right]+7$
$\left(3^{-3}\right)^{-2}$
$\left(-45\right)\left(-80\right)$
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