求lim(x趋向于0)[(1+X)^3-(1+3X)]/(X^2+X^3)极限
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求lim(x趋向于0)[(1+X)^3-(1+3X)]/(X^2+X^3)极限
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lim x趋向于1 1-x/1-x^(1/3) 求极限
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