\(a \times 1 = 1 \times a = a\). Đúng hay sai?

A. \(\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{34215}\\{\,2\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{...}\end{array}\)            

B. \(\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{34215}\\{\,\,\,\,\,\,\,2\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{...}\end{array}\)                   

C. \(\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,\,34215}\\{\,\,\,\,2\,\,}\end{array}}\\\hline{\,\,...}\end{array}\)   

D. \(\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{34215}\\{\,\,\,\,\,\,\,\,\,\,\,\,\,\,2\,\,}\end{array}}\\\hline{...}\end{array}\)

A. \(134784\)  

B. \(134794\)

C. \(135804\)

D. \(135814\)

A. Đúng

B. Sai

A. \(7988\)

B. \(7898\)

C. \(320036\)

D. \(320046\)

A. \(x = 29359\)

B.\(x = 293569\)

C.\(x = 293579\)

D. \(x = 293589\)