Dưới đây là kết quả của các phép tính trong bài:

### Bài 1: Thực hiện phép tính
1) \( 2 \frac{5}{8} + \frac{1}{6} = \frac{15}{24} + \frac{4}{24} = \frac{19}{24} \)

2) \( \frac{3}{5} + \frac{1}{10} = \frac{6}{10} + \frac{1}{10} = \frac{7}{10} \)

3) \( \frac{3}{5} - \frac{5}{4} = \frac{12}{20} - \frac{25}{20} = -\frac{13}{20} \)

4) \( \frac{2}{3} - \frac{1}{4} = \frac{8}{12} - \frac{3}{12} = \frac{5}{12} \)

5) \( \frac{5}{4} - \frac{1}{2} = \frac{5}{4} - \frac{2}{4} = \frac{3}{4} \)

6) \( \frac{-3}{4} + \frac{-1}{3} = -\frac{9}{12} - \frac{4}{12} = -\frac{13}{12} \)

7) \( \frac{7}{12} + \frac{1}{6} = \frac{7}{12} + \frac{2}{12} = \frac{9}{12} = \frac{3}{4} \)

8) \( 27 \frac{1}{12} = \frac{27 \cdot 12 + 1}{12} = \frac{325}{12} \)

9) \( 5 + \frac{3}{4} + \frac{3}{2} = 5 + \frac{3}{4} + \frac{6}{4} = 5 + \frac{9}{4} = \frac{29}{4} \)

10) \( \frac{5}{3} - \frac{2}{9} = \frac{15}{9} - \frac{2}{9} = \frac{13}{9} \)

11) \( \frac{5}{12} + \left(-\frac{3}{2}\right) + \frac{1}{2} = \frac{5}{12} - \frac{6}{12} + \frac{2}{12} = \frac{1}{12} \)

12) \( 2 \cdot 5 + \frac{3}{2} = 10 + \frac{3}{2} = \frac{20}{2} + \frac{3}{2} = \frac{23}{2} \)

### Bài 2: Thực hiện phép tính
1) \( \frac{2}{3} + \left( 1 \frac{3}{4} \right) = \frac{2}{3} + \frac{7}{4} = \frac{8}{12} + \frac{21}{12} = \frac{29}{12} \)

2) \( \frac{1}{7} - \left( \frac{6}{7} - \frac{1}{3} \right) = \frac{1}{7} - \left( \frac{18}{21} - \frac{7}{21} \right) = \frac{1}{7} - \frac{11}{21} = \frac{3}{21} - \frac{11}{21} = -\frac{8}{21} \)

3) \( \left(-\frac{1}{3}\right) \cdot 11 - 7 = -\frac{11}{3} - 7 = -\frac{11}{3} - \frac{21}{3} = -\frac{32}{3} \)

4) \( \left( \frac{3}{4} \right) + \frac{3}{4} \cdot 2 = \frac{3}{4} + \frac{3 \cdot 2}{4} = \frac{3}{4} + \frac{6}{4} = \frac{9}{4} \)

5) \( \left( \frac{9}{10} \right) + \left( 2 + \frac{5}{2} \right) = \frac{9}{10} + \frac{9}{2} = \frac{9}{10} + \frac{45}{10} = \frac{54}{10} = \frac{27}{5} \)

6) \( -\frac{3}{2} + 17 \div 24 = -\frac{3}{2} + \frac{17}{24} = -\frac{36}{24} + \frac{17}{24} = -\frac{19}{24} \)

### Bài 3: Thực hiện phép tính
1) \( 12 \cdot \left( \frac{1}{3} \right)^2 = 12 \cdot \frac{1}{9} = \frac{12}{9} = \frac{4}{3} \)

2) \( 18 \cdot \left( 1 \frac{1}{2} \right)^2 = 18 \cdot \left( \frac{3}{2} \right)^2 = 18 \cdot \frac{9}{4} = \frac{162}{4} = \frac{81}{2} \)

3) \( 15 \cdot \frac{2}{3} = 10 \)

4) \( 1 + 3^2 \cdot 2 \div 9 = 1 + 9 \cdot 2 \div 9 = 1 + 2 = 3 \)

5) \( \left(-\frac{3}{4}\right)^2 - \left(-\frac{9}{4}\right) = \frac{9}{16} + \frac{9}{4} = \frac{9}{16} + \frac{36}{16} = \frac{45}{16} \)

6) \( -\left(\frac{3}{2}\right)^2 = -\frac{9}{4} \)

7) \( 3 + \left(-6\right) = -3 \)

### Bài 4: Thực hiện phép tính
1) \( \frac{1}{3} + \frac{1}{3} - 8 + 9 = 2 - 8 + 9 = 3 \)

2) \( 5 \cdot \frac{1}{2} - \left( -\frac{1}{2} \right)^2 = \frac{5}{2} - \frac{1}{4} = \frac{10}{4} - \frac{1}{4} = \frac{9}{4} \)

3) \( -\left(-1\right)^3 + \frac{8}{27} = -(-1) + \frac{8}{27} = 1 + \frac{8}{27} = \frac{27}{27} + \frac{8}{27} = \frac{35}{27} \)

4) \( -\left( 1 \cdot -7 \right) - \frac{4}{9} \cdot -\left(\frac{2}{3}\right)^2 = 7 - \frac{4}{9} \cdot \frac{4}{9} = 7 - \frac{16}{81} = \frac{567}{81} - \frac{16}{81} = \frac{551}{81} \)

5) \( \left(-1\right)^2 - 1 + 2 = 1 - 1 + 2 = 2 \)

6) \( \left(-\frac{1}{2}\right)^2 - 5 = \frac{1}{4} - 5 = \frac{1 - 20}{4} = -\frac{19}{4} \)

Nếu bạn cần hỗ trợ thêm hay chi tiết về từng bài, hãy cho tôi biết!