我想问下2和4为什么是对的,(2中我把x 等于零进去后面不就成根号负2009,怎么会成立呢)
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![我想问下2和4为什么是对的,(2中我把x 等于零进去后面不就成根号负2009,怎么会成立呢)](/uploads/image/z/13411979-35-9.jpg?t=%E6%88%91%E6%83%B3%E9%97%AE%E4%B8%8B2%E5%92%8C4%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E5%AF%B9%E7%9A%84%2C%EF%BC%882%E4%B8%AD%E6%88%91%E6%8A%8Ax+%E7%AD%89%E4%BA%8E%E9%9B%B6%E8%BF%9B%E5%8E%BB%E5%90%8E%E9%9D%A2%E4%B8%8D%E5%B0%B1%E6%88%90%E6%A0%B9%E5%8F%B7%E8%B4%9F2009%2C%E6%80%8E%E4%B9%88%E4%BC%9A%E6%88%90%E7%AB%8B%E5%91%A2%EF%BC%89)
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