$\frac{2}{5}m+\frac{1}{10}m-m$
$\frac{2}{5}x^4-\frac{1}{2}x^3y+3x^4-y^4-0.3x^4-\frac{3}{5}x^3y-12$
$\left(2-\sqrt{y}\right)^2$
$a^3-a^2\:\:7a^2b+9ab^2$
$a^8.a^3.a^5$
$\lim_{x\to\infty}\left(\frac{4x+sin2x}{x}\right)$
$-11x^6\cdot22x^8$
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