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最佳答案：|a|=-a.a=-b.(a+b)^2 ≥0cd=0.ab ≠0
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最佳答案：有理数,算术之奇数也.其所含者,正整数、负整数、零也.或有人视之为正负数,以其为易,然为彼所惑者甚众,算术鸿儒亦如是,余于有理数所解如下：有理数之解众皆明之——
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最佳答案：1.We are going to make the sky bright and water clean in Jingzhou.2.We are going
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最佳答案：正数Positive number、负数Negative number、整数Integer、有理数Rational number、无理数Irrational n
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最佳答案：The article starts from the origin of numbers was discussed,back from birth to i