$\frac{1.2\cdot10^9}{3\cdot10^2}$
$0\cdot3$
$a^2-9a+5$
$3-2\cdot4+8$
$\left(+4\right)\cdot\left(-20\right)-\left(+5\right).\left(+10\right)$
$3x-\frac{1}{2}\left(2x+3x\right)$
$3.9+7+6-5.3$
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