当a<0是,化简丨2a-根号a²丨的结果是
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![当a<0是,化简丨2a-根号a²丨的结果是](/uploads/image/z/3153227-59-7.jpg?t=%E5%BD%93a%EF%BC%9C0%E6%98%AF%2C%E5%8C%96%E7%AE%80%E4%B8%A82a-%E6%A0%B9%E5%8F%B7a%26%23178%3B%E4%B8%A8%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AF)
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当a<0是,化简丨2a-根号a²丨的结果是
当a<0是,化简丨2a-根号a²丨的结果是
当a<0是,化简丨2a-根号a²丨的结果是
丨2a-根号a²丨=|2a-|a||=|2a+a|=3|a|=-3a
负3a
|2a-根号(a^2)|
=|2a-|a||
因为a<0
则2a-|a||=|(2a)-(-a)|=|3a|=-3a