在数学公式中，符号“∞”表示什么？
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Correct answer
A. 无穷大
Principle or equation
数学符号“∞”表示无穷大，用于描述无界增长的量。
Why this answer is correct
“∞”是无穷大的符号，常用于极限、级数等概念中。例如，当x趋于无穷大时，写作x→∞。
Example
函数f(x)=1/x，当x→∞时，f(x)趋于0。
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