同一球面上四点A，B，C，D满足AB=BC=√2，AC=2，且球的表面积为(25/4)π，则四面体ABCD体积的最大值为________。

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问题同一球面上四点A，B，C，D满足AB=BC=√2，AC=2，且球的表面积为(25/4)π，则四面体ABCD体积的最大值为________。

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