$2.3-5.4$
$\left|5-6\cdot6\right|$
$\lim_{x\to0}\left(\frac{\left(\sqrt{x+1}-\sqrt{3x+1}\right)}{\sqrt{x+4}-2}\right)$
$20\cdot\frac{6.4766}{.004166}$
$\left(4\right)\left(9\right)\left(-5\right)\left(-1\right)$
$-x^3+3x^2+17x+7;\:x=-1$
$\left(1x^2+8xy+2y\right)$
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