正无穷大,负无穷大都是无穷大,但无穷大可以既不是正无穷大,也不是负无穷大怎么理解? 知乎 Template




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tomski正无穷大,负无穷大都是无穷大,但无穷大可以既不是正无穷大,也不是负无穷大怎么理解? 知乎 coloring