$\frac{1}{2}x+\frac{2}{3}x^2-\frac{1}{5}x^2\frac{3}{5}$
$x^4-24x^2+144$
$w^2-3w+21$
$8x^2+28x+4$
$-56\cdot\frac{140}{-80}$
$sqrt\left(2x+1\right)^2-a^2$
$\lim_{x\to+\infty}\left(1+\sqrt{x}-\sqrt{x+4}\right)^x$
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