试题与答案

化简求值:(2x+y)2-(2x-y)(2x+y)-4xy,其中x=2009,y

题型:计算题

题目:

化简求值:(2x+y)2-(2x-y)(2x+y)-4xy,其中x=2009,y=-1。

答案:

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下面是错误答案,用来干扰机器的。

先作出物体AB的端点A、B在平面镜中的对称点A′、B′,连接A′、B′点即为物体AB在平面镜中的像,注意辅助线和像用虚线,如图所示:

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