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A.1 B.0 C. D.5
A.1 B.0 C.π+1 D.π
A.1 B.0 C.5 D.10
A.-1 B.0 C. D.1
等于
D.5
等于( )
等于( )
(
-
+
-…+
-
)的值为… ( )
D.1