Tính giá trị biểu thức \(B = \frac{1}{{2022}}.\frac{{ - 6}}{7} + \frac{{2021}}{{2022}}.\frac{{ - 6}}{7} + \frac{6}{7}\)

\(B = \frac{1}{{2022}}.\frac{{ - 6}}{7} + \frac{{2021}}{{2022}}.\frac{{ - 6}}{7} + \frac{6}{7}\)

\(B = \frac{1}{{2022}}.\frac{{ - 6}}{7} + \frac{{2021}}{{2022}}.\frac{{ - 6}}{7} - \frac{{ - 6}}{7}\)

\(B = \left( {\frac{1}{{2022}} + \frac{{2021}}{{2022}} - 1} \right).\frac{{ - 6}}{7}\)

\[B = 0 \cdot \left( {\frac{{ - 6}}{7}} \right)\]

\[B = 0\].