$w^2-100$
$\lim_{x\to5}\left(\frac{x^2-25}{x^2-5}\right)$
$-7\cdot2+-8\cdot5$
$\frac{2r-4}{r-2}$
$-9+3:-2+\left(-1\cdot1\right)$
$\sqrt[3]{\frac{x^4y^2}{125x}}$
$( \frac { 4 } { 5 } + 3 n ) ^ { 2 }$
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