$100\cdot3.154$
$144 p ^ { 2 } - 900 q ^ { 2 }$
$20 - 5 \cdot 4$
$logr=3$
$\left(2x-1\right)dx+\left(7y+4\right)dy=0$
$ydy-4xdx=0$
$-36-\left(64+2\cdot1\cdot9\right)$
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