$\lim_{x\to\infty}\frac{\sqrt{1+x}-\left(1+\frac{x}{2}\right)}{x^2}$
$3.2+3.\left(-5\right)$
$4x^{\left(7\right)}-3x^{\left(5\right)}-7x^{\left(3\right)}$
$\frac{1}{2}m=87$
$-\left|20\right|$
$\frac{7x+2x^2-6}{2x-3x^2}$
$8a^2-24ab+18b^2$
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