$\frac{5^9}{5^5}$

$\left(\frac{1}{3}x+y\right)^2$

$4\left(x+2\right)-3\left(x-5\right)en$

$+5+7-1+\left(-62-4+68\right)-\left(-17+1-6\right)$

$\sqrt{1+\left(\frac{y^3}{6}+\frac{1}{2y}\right)^2}$

$\frac{\left(2+h\right)^2-4}{h}$

$\left(42-25\right)-3\cdot\left(5\cdot\left(16-3\cdot4\right)\right)+7$