试题与答案

先化简，再求值：m2-2mn+2（m2+mn-n2），其中m=-2，n=3．

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题型：解答题

题目：

先化简，再求值：m2-2mn+2（m2+mn-n2），其中m=-2，n=3．

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C

考点：整式的加减
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