Tính
----- Nội dung dịch tự động từ ảnh -----
3. Tính
a) \( A = \left(1 - \frac{2}{3} + \frac{4}{3}\right) - \left(\frac{4}{5} - 1\right) + \left(\frac{7}{5} + 2\right) \)
b) \( B = 1 - 3 + \frac{3}{4} - \frac{1}{3} \cdot \left(5 + \frac{2}{5} - \frac{2}{3}\right) \)
c) \( C = \left(\frac{3}{5} - \frac{4}{15}\right) \cdot \left(\frac{2}{7} - \frac{9}{14}\right) - \frac{5}{9} - \frac{7}{27} \cdot \left(1 - \frac{3}{5}\right) + \)
\(\left(1 - \frac{11}{12}\right) \cdot \left(1 + \frac{11}{12}\right)\)
3. Tính
a) \( A = \left(1 - \frac{2}{3} + \frac{4}{3}\right) - \left(\frac{4}{5} - 1\right) + \left(\frac{7}{5} + 2\right) \)
b) \( B = 1 - 3 + \frac{3}{4} - \frac{1}{3} \cdot \left(5 + \frac{2}{5} - \frac{2}{3}\right) \)
c) \( C = \left(\frac{3}{5} - \frac{4}{15}\right) \cdot \left(\frac{2}{7} - \frac{9}{14}\right) - \frac{5}{9} - \frac{7}{27} \cdot \left(1 - \frac{3}{5}\right) + \)
\(\left(1 - \frac{11}{12}\right) \cdot \left(1 + \frac{11}{12}\right)\)