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Câu 5:

Tính tổng các hệ số trong khai triển ${\left( {1 - 2x} \right)^{2019}}$

Câu 5: Tính tổng các hệ số trong khai triển (1−2x)2019{\left( {1 - 2x} \right)^{2019}}(1−2x)2019.

Thông tin câu hỏi

Câu 5:

Tính tổng các hệ số trong khai triển ${\left( {1 - 2x} \right)^{2019}}$ .