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已知:正方体ABCD-A1B1C1D1 ,AA1=2,E为棱CC1的中点.(Ⅰ) 求证:B...
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已知:正方体ABCD-A
1B
1C
1D
1 ,AA
1=2,E为棱CC
1的中点.
(Ⅰ) 求证:B
1D
1⊥AE;
(Ⅱ) 求证:AC∥平面B
1DE.
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已知:正方体ABCD-A1B1C1D1 ,AA1=2,E为棱CC1的中点.
(Ⅰ) 求证:B1D1⊥AE;
(Ⅱ) 求证:AC∥平面B1DE.
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已知:正方体ABCD-A1B1C1D1 ,AA1=2,E为棱CC1的中点.
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