Tính rồi thử lại (theo mẫu)

Mẫu: \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5746}\\{1962}\end{array}} \\\,\,\,3784\end{array}\)                                    Thử lại: \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{3784}\\{1962}\end{array}} \\\,\,\,\,5746\end{array}\)
a)               8 923 – 4 157 ................................................................. ................................................................. ................................................................. .................................................................	27 069 – 9 537 ................................................................. ................................................................. ................................................................. .................................................................
b)             \(\frac{8}{{15}} - \frac{2}{{15}}\) ................................................................. ................................................................. ................................................................. .................................................................	\(1 - \frac{3}{7}\) ................................................................. ................................................................. ................................................................. .................................................................
c)             7,284 – 5,596 ................................................................. ................................................................. ................................................................. .................................................................	0,863 – 0,298 ................................................................. ................................................................. ................................................................. .................................................................