Điền số thích hợp vào ô trống a) \[\begin{array}{l} + \underline {\begin{array}{*{20}{c}}{134,75}\\{276,13}\end{array}} \\\,\,\,\,......,...\end{array}\] b) \[\begin{array}{l} - \underline {\begin{array}{*{20}{c}}{378,9}\\{\,\,\,\,\,\,12,87}\end{array}} \\\,\,\,\,\,\,......,....\end{array}\] 
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