如图所示的三个图中，上面的是一个长方体截去一个角所得多面体的直观图，它的正视图和侧视图在下面画出（ 如图的三个图中，上面的是一个长方体截去一个角所得多面体的直观...
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（1）如图（2）所求多面体的体积V＝V长方体?V正三棱锥＝4×4×6?
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（3）证明：如图，
在长方体ABCD-A′B′C′D′中，连接AD′，则AD′∥BC′
因为E，G分别为AA′，A′D′中点，所以AD′∥EG，从而EG∥BC′，
又EG?平面EFG，所以BC′∥平面EFG；
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