A.1/2 B.-1/2 C.士1/2 D.1/4 E.士1/4

练习题库2022-08-02  50

问题 A.1/2B.-1/2C.士1/2D.1/4E.士1/4

选项 A.1/2
B.-1/2
C.士1/2
D.1/4
E.士1/4

答案 A

解析
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