Tìm x biết rằng
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a) \( \left( \frac{2}{3} \right)^{2} \cdot x = \left( \frac{2}{3} \right)^{4} ; \)
b) \( \left( -\frac{5}{9} \right)^{10} : x = \left( -\frac{5}{9} \right)^{8} ; \)
c) \( \left( x + \frac{2}{5} \right)^{2} = \frac{9}{16}; \)
d) \( (3x - 4)^{2} = \left( -\frac{3}{4} \right)^{2} ; \)
e) \( \left( x - \frac{1}{2} \right)^{3} = -8; \)
f) \( \left( \frac{2}{5} - 3x \right)^{2} - \frac{1}{5} = \frac{4}{25}; \)
a) \( \left( \frac{2}{3} \right)^{2} \cdot x = \left( \frac{2}{3} \right)^{4} ; \)
b) \( \left( -\frac{5}{9} \right)^{10} : x = \left( -\frac{5}{9} \right)^{8} ; \)
c) \( \left( x + \frac{2}{5} \right)^{2} = \frac{9}{16}; \)
d) \( (3x - 4)^{2} = \left( -\frac{3}{4} \right)^{2} ; \)
e) \( \left( x - \frac{1}{2} \right)^{3} = -8; \)
f) \( \left( \frac{2}{5} - 3x \right)^{2} - \frac{1}{5} = \frac{4}{25}; \)