题干
在下列运算中，正确的是( )
A：a·a=a
B：a+a=a
C：(a)=a
D：a(a+1)=a![](http://tiku.21cnjy.c </p>
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<h2 class="title daan" data="3988159">答案(点此获取答案解析）</h2>
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A
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<h2 class="title">同类题1</h2>
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根据图片，判断句子是否正确。<p><img data-cke-saved-src="/Upload/site3/0/c/0c1550904785a82403e4253791c62853.png" src="/Upload/site3/0/c/0c1550904785a82403e4253791c62853.png" v:shapes="图片_x0020_37" height="77" width="120"></p><p>—Where is the music room?</p><p>—It)