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lim (x 趋向于无穷)e^-x^2*cosx
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求lim x趋向于无穷时(-X)/(2X^2+3x-1)答案
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lim(x趋向无穷)[1-(2/x)]^3x
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求下列式子的值(1)lim(x趋向无穷) (2x+7)/[(x-1)(x+2)]=?(2)lim(x趋向无穷) (3x^