$\left(\frac{2}{3}a^2-\frac{4}{5}\right)^2$
$x=7;\:y=3$
$x-y+z-x-y+z$
$\lim_{x\to4}\left(\frac{2x+4}{x^2-16}\right)$
$\sqrt{27a^7}$
$5\left(\infty^2\right)-3\left(\infty\right)-10$
$4\cdot\left(-1\right)-\left(-1\right)-\left(-1\right)-\left(-1\right)$
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