$7\sqrt{3}\cdot\sqrt{a^2}\cdot\sqrt{b^2}$
$\left|\left(-4+9-1\right)\cdot\left(-1-2\right)\right|-\left|-\left(-5\right)+\left(-7\right)\right|\cdot4$
$\int_0^{7\sqrt{3}}\left(\frac{19}{\sqrt{196-x^2}}\right)dx$
$9a^4+36a^2+36b^2$
$2x+5y+7x-y$
$\left(\frac{2x-1}{x+3}\right)\le1$
$6.25l^2+5l+1$
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