limx→1(x3−x2−x−1x2−x)\lim_{x\to1}\left(\frac{x^3-x^2-x-1}{x^2-x}\right)x→1lim(x2−xx3−x2−x−1)
25x2y2−20xy+4y225x^2y^2-20xy+4y^225x2y2−20xy+4y2
9−x2x+2\frac{9-x^2}{x+2}x+29−x2
10(4x+9)10\left(4x+9\right)10(4x+9)
2(−3+4)−(−3−4)2−3+4\frac{2\left(-3+4\right)-\left(-3-4\right)^2}{\sqrt{-3+4}}−3+42(−3+4)−(−3−4)2
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