8-2=______．-数学

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• 阅读下面例题：计算4+15-4-15．∵(4+15-4-15)2=4+15-24+15•4-15+4-15=6而4+15＞4-15∴4+15-4-15=6请参照例题计算5+21+5-21．-数学
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• 24+613-（348-6）-数学
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