Tính \(7 \cdot {2^3} - 5\left\{ {\left[ {10,51 + 4 \cdot {{\left( {\frac{3}{4} - \frac{2}{5}} \right)}^2}} \right] - {{2021}^0}} \right\}\)

Đáp án đúng là: A

\(7 \cdot {2^3} - 5\left\{ {\left[ {10,51 + 4 \cdot {{\left( {\frac{3}{4} - \frac{2}{5}} \right)}^2}} \right] - {{2021}^0}} \right\}\)

\( = 7 \cdot 8 - 5\left\{ {\left[ {10,51 + 4 \cdot {{\left( {\frac{7}} \right)}^2}} \right] - 1} \right\}\)

\( = 56 - 5\left\{ {\left[ {10,51 + 4 \cdot \frac} \right] - 1} \right\}\)

\( = 56 - 5\left\{ {\left[ {10,51 + \frac} \right] - 1} \right\}\)

\( = 56 - 5\left\{ {\left[ {10,51 + 0,49} \right] - 1} \right\}\)

\( = 56 - 5\left\{ {11 - 1} \right\}\)

\( = 56 - 5 \cdot 10 = 6\)