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微分学

课程 14: 无穷极限

无穷极限: 代数

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让 f, left parenthesis, x, right parenthesis, equals, start fraction, 3, divided by, x, end fraction.

选出形容当 x, equals, 0 时关于 f 的正确答案。

(选择 A)
limit, start subscript, x, \to, 0, start superscript, plus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, plus, infinity 且limit, start subscript, x, \to, 0, start superscript, minus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, plus, infinity
(选择 B)
limit, start subscript, x, \to, 0, start superscript, plus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, plus, infinity 且limit, start subscript, x, \to, 0, start superscript, minus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, minus, infinity
(选择 C)
limit, start subscript, x, \to, 0, start superscript, plus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, minus, infinity 且 limit, start subscript, x, \to, 0, start superscript, minus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, plus, infinity
(选择 D)
limit, start subscript, x, \to, 0, start superscript, plus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, minus, infinity 且limit, start subscript, x, \to, 0, start superscript, minus, end superscript, end subscript, f, left parenthesis, x, right parenthesis, equals, minus, infinity

不会做了？