$\lim_{x\to1}\left(\frac{2x+1}{x}\right)$
$x+4\ge0$
$-13-\left(-7\right)$
$x'+\left(\frac{3}{125}\right)x=0.6$
$e^xy'=2x$
$12,50+8,23$
$\left(-10\right).\:\left(+3\right)\:.\:\left(-1\right)$
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