$81a^2-90ab+25b^2$
$w^2-5w+\frac{24}{4}$
$\frac{2x^2-3}{x-2}$
$x^2-11x-121$
$\left(5b-2\right)^2+4=25b^2-20b$
$15x^3+21x^2$
$\left(\frac{1}{7}a+5\right)^2$
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