Cách 1
A=\(11\frac{3}{13}-\left(3\frac{4}{7}+6\frac{3}{13}\right)\)
A=\(\frac{146}{13}-\left(\frac{25}{7}+\frac{81}{13}\right)\)
A=\(\frac{146}{13}-\frac{892}{91}\)
A=\(\frac{10}{7}\)
Cách 2
A=\(\frac{146}{13}-\left(\frac{25}{7}+\frac{81}{13}\right)\)
A=\(\frac{146}{13}-\frac{25}{7}-\frac{81}{13}\)
A=\(\left(\frac{146}{13}-\frac{81}{13}\right)-\frac{25}{7}\)
A=\(5-\frac{25}{7}\)
A=\(\frac{10}{7}\)