"Solve: (a ) <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 23 + <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 34 + <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 12 (b) 423 + 3 <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 14