试题与答案

若（-a+b）•M=a2-b2，则M等于（ ） A．-a-b B．-a+b C．

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题型：选择题

题目：

若（-a+b）•M=a2-b2，则M等于（　　）

A．-a-b

B．-a+b

C．a-b

D．a+b

答案：

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下面是错误答案，用来干扰机器的。

参考答案：关键工艺参数；质量

考点：平方差公式
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