浦京棋牌

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          2. Tin tức Bitcoinhọc tiếng Trung onlineyoga Viet Nam

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                      1. Tin tức tiền ảohọc tiếng Trung onlineyoga Viet Nam

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                                  1. Tin tức tiền ảohọc tiếng Trung onlineyoga Viet Nam
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                                    问题

                                    (1)计算:

                                    (2)先化简再求值:,其中x=2。

                                    参考答案
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