100C0-100C2+100C4-...-100C98+100C100等于
100C0-100C2+100C4-...-100C98+100C100等于A.-2^50B.0C.1D.2^50...
100C0-100C2+100C4-...-100C98+100C100等于
A.-2^50
B.0
C.1
D.2^50 展开
A.-2^50
B.0
C.1
D.2^50 展开
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