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数学
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已知实数a,b满足0＜a＜b+1,试判断a²-1与b²+2b大小
人气：499 ℃ 时间：2020-06-04 16:58:50
解答
b²＋2b－﹙a²-1﹚=﹙b＋1﹚²-a²＞0∴a²-1＜b²＋2b
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