limx−1(x2−x−2x+1)\lim_{x-1}\left(\frac{x^2-x-2}{x+1}\right)x−1lim(x+1x2−x−2)
2⋅2⋅b⋅n2\cdot2\cdot b\cdot n2⋅2⋅b⋅n
x−2+x+32=a\frac{\sqrt{x-2}+\sqrt{x+3}}{2}=a2x−2+x+3=a
x3x3x45\sqrt[5]{x^3\sqrt{x^3\sqrt{x^4}}}5x3x3x4
ab4b4\frac{ab^4}{b^4}b4ab4
y′′−5y′=0y''-5y'=0y′′−5y′=0
sin(x2)=−12\sin\left(\frac{x}{2}\right)=-\frac{1}{\sqrt{2}}sin(2x)=−21
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