Выберите правильный вариант записи и подсчёта при умножении на двузначное число:

• \(\begin{align*} & \quad \quad \quad \quad \quad \quad \quad \quad \quad \begin{array}{cccc} {}_{\times} & 6 & 4 & 8 \\ \end{array} \\ & \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \frac{\begin{array}{cccc} & & 6 & 8 \\ \end{array}}{\begin{array}{cccc} 5 & 1 & 8 & 4 \\ \end{array}} \\ & \quad \quad \quad \quad \frac{\begin{array}{ccccc} {}^{+} & 3 & 8 & 8 & 8 \\ \end{array}}{\begin{array}{ccccc} & 9 & 0 & 7 & 2 \\ \end{array}} \\ & \end{align*}\)
• \(\begin{array}{l} \,\,\,\,\,\,\,\,\,\,\begin{array}{lll} {}_{\times} & 6 & 4 & 8 \end{array} \\ \,\,\,\,\,\,\,\,\,\,\,\,\frac{\begin{array}{llll} {\,\,\,} & {\,\,\,} & 6 & 8 \end{array}}{\begin{array}{llll} 5 & 1 & 8 & 4 \end{array}} \\ \frac{\begin{array}{lllll} {}^{+}{3} & 8 & 8 & 8 & {\,\,\,\,} \end{array}}{\begin{array}{lllll} {}{4} & 4 & 0 & 6 & 4 \end{array}} \\ {}\end{array}\)
• \(\begin{align*}\begin{array}{cccc} & & 6 & 4 & 8 \\ \times & & & 6 & 8 \\ \hline & & 5 & 1 & 8 & 4 \\ + & 3 & 8 & 8 & 8 & \\ \hline & 5 & 5 & 7 & 2 & 8 \end{array}\end{align*}\)
• \(\begin{align*}\begin{array}{cccc} & & 6 & 8 \\ 3 & 8 & 8 & 8 \\ + & 5 & 1 & 8 & 4 \\ & 9 & 0 & 7 & 2 \end{array}\end{align*}\)