Đáp án đúng: A
Giải chi tiết:\(\begin{array}{l}A = \frac{{2018 \times 2019 - 54}}{{2018 \times 2018 + 1964}} = \frac{{2018 \times (2018 + 1) - 54}}{{2018 \times 2018 + 1964}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{2018 \times 2018 + 2018 \times 1 - 54}}{{2018 \times 2018 + 1964}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{2018 \times 2018 + 2018 - 54}}{{2018 \times 2018 + 1964}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{2018 \times 2018 + 1964}}{{2018 \times 2018 + 1964}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1\end{array}\)
Đáp số: 1
Chọn A
