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@Grok 解决以下几何问题：底面边长为 4 的正四棱锥被平行于其底面的平面所截，截去一个底面边长为 2 ，高为 3 的正四棱锥，所得棱台的体积为多少？
待领取礼包怎么进，按你的步骤只显示以前的使用的优惠，没有待领取礼包按钮
ios没有待领取礼包可点
