Hệ Số Của X7 Trong Khai Triển X-1x13 Là: | Cungthi.online

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Câu hỏi

Hệ số của x7 trong khai triển x-1x13 là:

A.

-C134

B.

C134

C.

-C133

D.

C133

Đáp án và lời giải Đáp án:C Lời giải:

-C133

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