A.P/2,(-3/2)P B.(-3/2)P,P/2 C.(-4/5)P,-P/5 D.-P/2,-P/2

题目

A.P/2,(-3/2)P
B.(-3/2)P,P/2
C.(-4/5)P,-P/5
D.-P/2,-P/2

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