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|a+b|是大於0的, 因為|a+b|=|a|-|b|, 所以|a|-|b|>0, 所以|a|>|b|, 又因為|a+b|=|a|-|b|,(因為當a>0,b>0時|a+b|=|a|+|b|;當a>0,b
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