x→x0

        无穷小与无穷大

        无穷小:趋于0、可正可负?O是唯一无穷小的常数

        无穷小十无穷小.?无穷小一无穷小

        天穷小×无穷小.?C*无穷小

        无穷大:+∞,-∞.lim=∞

        x→∞

        f(x)无穷大,1/f(x)无穷小.

        f(x)无穷小,1/f(x)无穷大.

        极限的运算法则

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