A、B=P1AP2 B、B=P2AP1 C、B=P2-1AP1 D、B=P1-1AP2-1 D

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问题

选项 A、B=P1AP2
B、B=P2AP1
C、B=P2-1AP1
D、B=P1-1AP2-1

答案D

解析
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