Điền vào chỗ chấm

a)

\[\begin{array}{l} + \begin{array}{*{20}{c}}{137\,\,210}\\{\underline {230780} }\end{array}\\\,\,\,\,.............\end{array}\]

b)

\[\begin{array}{l} - \begin{array}{*{20}{c}}{267\,900}\\{\underline {\,\,\,23\,\,580} }\end{array}\\\,\,\,\,.............\end{array}\]