Tính: 5) \( H = \frac{4}{15} - \frac{23}{28} - \left( -\frac{23}{28} + \frac{-11}{15} + \frac{29}{27} \right) - \frac{2}{27}; \) 6) \( K = \frac{1}{16} \frac{5}{21} + \left( -\frac{1}{16} + \frac{-3}{5} - \frac{5}{21} \right) + \frac{-2}{5} + \frac{3}{4} \)

Tính giá trị biểu thức
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5) \( H = \frac{4}{15} - \frac{23}{28} - \left( -\frac{23}{28} + \frac{-11}{15} + \frac{29}{27} \right) - \frac{2}{27}; \)

6) \( K = \frac{1}{16} \frac{5}{21} + \left( -\frac{1}{16} + \frac{-3}{5} - \frac{5}{21} \right) + \frac{-2}{5} + \frac{3}{4}; \)