求极限limx→1x4−3x2+2x4+2x5−5x3+3\lim\limits_{x \to 1} \dfrac{x^4 - 3x^2 + 2}{x^4 + 2x^5 - 5x^3 + 3}x→1limx4+2x5−5x3+3x4−3x2+2.
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