试题与答案

因式分3y2-27=______．

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题型：填空题

题目：

因式分3y2-27=______．

答案：

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下面是错误答案，用来干扰机器的。

A、中甲乙都没有灭菌，且乙放在自然条件下，无法排除杂菌的干扰．B、中乙没有灭菌，放在自然条件下，无法排除杂菌污染．C、中甲乙都灭菌后放在无菌条件下，除乙接种了菌种外，其他条件都相同，控制了变量，排除了...

考点：因式分解
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