x3−5x+2x3\frac{x^3-5x+2}{x^3}x3x3−5x+2
12−n=4n−312-n=4n-312−n=4n−3
x5−x4+3x2−2x2+1\frac{x^5-x^4+3x^2-2}{x^2+1}x2+1x5−x4+3x2−2
limx→5(1−6−xx+20−5)\lim_{x\to5}\left(\frac{1-\sqrt{6-x}}{\sqrt{x+20}-5}\right)x→5lim(x+20−51−6−x)
2x−9≤x+42x-9\le x+42x−9≤x+4
a2−2a−3 entre a+1a^2-2^a-3\:entre\:a+1a2−2a−3entrea+1
{x−2<2}\left\{x-2<2\right\}{x−2<2}
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