Thực hiện phép tính
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a) \( \left( -\frac{3}{4} + \frac{2}{7} \right) \cdot \frac{2}{3} + \left( -\frac{1}{4} + \frac{5}{7} \right) \cdot \frac{2}{3} \)
b) \( \left( -\frac{1}{2} \right)^{2} \cdot \frac{6}{7} \cdot \frac{14}{15} \cdot 2^{\frac{1}{3}} + (-1, 21)^{0} \)
c) \( 4 \cdot \left( -\frac{1}{2} \right)^{3} + \left| -\frac{1}{2} \right| + \sqrt{\frac{9}{4}} \cdot \sqrt{25} \)
d) \( \left[ 6 - 3 \cdot \left( -\frac{1}{3} \right)^{2} + \sqrt{\frac{1}{4}} \cdot \sqrt{9} \right] \)
a) \( \left( -\frac{3}{4} + \frac{2}{7} \right) \cdot \frac{2}{3} + \left( -\frac{1}{4} + \frac{5}{7} \right) \cdot \frac{2}{3} \)
b) \( \left( -\frac{1}{2} \right)^{2} \cdot \frac{6}{7} \cdot \frac{14}{15} \cdot 2^{\frac{1}{3}} + (-1, 21)^{0} \)
c) \( 4 \cdot \left( -\frac{1}{2} \right)^{3} + \left| -\frac{1}{2} \right| + \sqrt{\frac{9}{4}} \cdot \sqrt{25} \)
d) \( \left[ 6 - 3 \cdot \left( -\frac{1}{3} \right)^{2} + \sqrt{\frac{1}{4}} \cdot \sqrt{9} \right] \)