$-1+\frac{4k}{n}\left(-1+\frac{4k}{n}\right)$
$\left(-5\right)^2\cdot\left(\frac{2}{5}\right)^2$
$\int\frac{1}{100+x^2}dx$
$8m^3-128m$
$\int\frac{5x-1}{x^2-5x+4}dx$
$6-4:2-5.3+6:2.2$
$\frac{7x^3+14x^2}{14x^2+28x}$
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