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如图所示,在正三棱柱ABC-A1B1C1中,底面边长为a,侧棱长为,D是棱A1C1的中点....
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如图所示,在正三棱柱ABC-A
1B
1C
1中,底面边长为a,侧棱长为
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABsAAAAkCAYAAAB4+EEtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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+ldgxOzXZMyZOTBCViE8YFs+TluOda/qzBkDci8i2LZtAWSdFczrK9xzYCRfh+vjugedwDCyq8DQ
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A36yqxssypi4EAPtBHwClnbmjuAtjVszSzvzvktJNjElUoGN7MxtZuUbTBJIo6tpEHLbIBWTFsNt
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GicmAAAAAElFTkSuQmCC
)
,D是棱A
1C
1的中点.
(Ⅰ)求证:BC
1∥平面AB
1D;
(Ⅱ)求二面角A
1-AB
1-D的大小.
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