Điền số thích hợp vào ô trống a) + 134 , 75 276 , 13 –––––––– . . . . . . , . . . b) − 378 , 9 12 , 87 –––––––––– . . . . . . , . . . .

a)

\[\begin{array}{l} + \underline {\begin{array}{*{20}{c}}{134,75}\\{276,13}\end{array}} \\\,\,\,\,......,...\end{array}\]

b)

\[\begin{array}{l} - \underline {\begin{array}{*{20}{c}}{378,9}\\{\,\,\,\,\,\,12,87}\end{array}} \\\,\,\,\,\,\,......,....\end{array}\]