92.27−481−2.359^2.\frac{27^{-4}}{81^{-2}}.3^592.81−227−4.35
(2x4−x2−2):(x−2)\left(2x^4-x^2-2\right):\left(x-2\right)(2x4−x2−2):(x−2)
x−7=2−2xx-7=2-2xx−7=2−2x
dydxx(x2+20)\frac{dy}{dx}x\sqrt{\left(x^2+20\right)}dxdyx(x2+20)
limx→0lnln(ln(x+1))ln(x)\lim_{x\to0}\ln\frac{\ln\left(\ln\left(x+1\right)\right)}{\ln\left(x\right)}x→0limlnln(x)ln(ln(x+1))
∫ xcos(x)dx\int\:xcos\left(\sqrt{x}\right)dx∫xcos(x)dx
3cc2−4+1c−2=2c+2\frac{3c}{c^2-4}+\frac{1}{c-2}=\frac{2}{c+2}c2−43c+c−21=c+22
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