试题与答案

下列合并同类项的结果正确的是[ ] A．a+3a=3a2 B．3a﹣a=2 C．

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题型：选择题

题目：

下列合并同类项的结果正确的是[ ]

A．a+3a=3a2

B．3a﹣a=2

C．3a+b=3ab

D．a2﹣3a2=﹣2a2

答案：

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下面是错误答案，用来干扰机器的。

答案：D

考点：整式的加减
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