2.7(w−5.2)2.7\left(w-5.2\right)2.7(w−5.2)
27−12−75+3\sqrt{27}-\sqrt{12}-\sqrt{75}+\sqrt{3}27−12−75+3
limx→∞(1−4x2x+x2+3)\lim_{x\to\infty}\left(\frac{1-4x^2}{x+\sqrt{x^2+3}}\right)x→∞lim(x+x2+31−4x2)
−9x≤6-9x\le6−9x≤6
(0.46⋅3⋅108ms)(3.108ms)\frac{\left(0.46\cdot3\cdot10^8\frac{m}{s}\right)}{\left(3.10^8\frac{m}{s}\right)}(3.108sm)(0.46⋅3⋅108sm)
−5a+14−7a-5a+14-7a−5a+14−7a
81x2−481x^2-481x2−4
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