摘要：长方体ABCD-A1B1C1D1.AC1为体对角线．现以A为球心.AB.AD.AA1.AC1为半径作四个同心球.其体积依次为V1.V2.V3.V4.则有 (A)V4＜V1+V2+V3 (B)V4=V1+V2+V3 (C)V4＞V1+V2+V3 (D)不能确定.与长方体的棱长有关

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