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【简答题】
已知六边形AC 1 BA 1 CB 1 中AC 1 =AB 1 ,BC 1 =BA 1 ,CA 1 =CB 1 ,∠A+∠B+∠C=∠A 1 +∠B 1 +∠C 1 ,求证△ABC面积是六边形AC 1 BA 1 CB 1 的一半.
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