$\left(\frac{1}{7}a^5+\frac{b^2}{4}\right)\left(\frac{1}{7}a^5-\frac{b^2}{4}\right)$
$9^3-a^2+a$
$3x^2-3\left(x-1\right)>-\:\frac{2}{3}$
$1^7$
$\lim_{x\to\infty}\frac{\sqrt{x^2+4}}{x+x^2}$
$x^2+2xy+y^2,x=2y=2.5$
$\sqrt{36\cdot6}$
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