2(x4−9x2+4x)2\left(x^4-9x^2+4x\right)2(x4−9x2+4x)
3x3−8x2+6x−5x+2\frac{3x^3-8x^2+6x-5}{x+2}x+23x3−8x2+6x−5
limx→∞(−7x4+9x2+100)\lim_{x\to\infty}\left(-7x^4+9x^2+100\right)x→∞lim(−7x4+9x2+100)
3y+37+2=y+1\sqrt{3y+37}+2=y+13y+37+2=y+1
3090(21)\frac{30}{90}\left(21\right)9030(21)
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