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如图, AM 为 ∠ BAC 的平分线,下列等式错误的是 ( )
A. 1 2 ∠ BAC = ∠ BAM B. ∠ BAM = ∠ CAM C. ∠ BAM = 2 ∠ CAM D. 2 ∠ CAM = ∠ BAC
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