$7+\left(-2-\left(-5+8\right)\right)$
$\left(-6\right)+\left(-2\right)\left(5\right)-\left(3\right)$
$\lim_{x\to4}\left(\frac{\sqrt{2x+1}-\sqrt{x+5}}{x+4}\right)$
$\left(2a^2b^3c^2\right)^3$
$x+3<2x$
$0.1109\cdot4$
$\left(40f^3-30g^2\right)^2$
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