The greatest common divisor of a and b is 21,and the least common multiple of a and b is 126,where
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The greatest common divisor of a and b is 21,and the least common multiple of a and b is 126,where
a and b are positive integers,what is the sum of a and
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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