Rút gọn, \( B = \frac{30.4^{7} \cdot 3^{29} - 5.14^{5} \cdot 2^{12}}{54.6^{14} \cdot 9^{7} - 12.8^{5} \cdot 7^{5}} \)

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e) \( B = \frac{30.4^{7} \cdot 3^{29} - 5.14^{5} \cdot 2^{12}}{54.6^{14} \cdot 9^{7} - 12.8^{5} \cdot 7^{5}} \)

f) \( C = \frac{5^{10} \cdot 7^{3} - 25^{5} \cdot 49^{2}}{(125.7)^{3} + 5^{9} \cdot 14^{3}} \)