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(16)⁷ * (25)⁵ * (81)³

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(15)⁷ * (24)⁵ * (80)³

$\frac{(16)^{7} \times (25)^{5} \times {(81)}^{3}}{{(15)}^{7} \times {(24)}^{5} \times {(80)}^{3}} = \frac{{(2^{4})}^{7} \times {(5^{2})}^{5} \times {3^{4}}^{3}}{(3 \times 5)^{7} \times {(2 \times 2 \times 2 \times 3)}^{5} \times {(2^{4} \times 5)}^{3}} = \frac{2^{28} \times 5^{10} \times 3^{12}}{3^{7} \times 2^{15} \times 3^{5} \times 5^{7} \times 2^{12} \times 5^{3}} = \frac{2^{28 - 15 - 12}}{3^{7 + 5 - 12} \cdot 5^{7 + 3 - 10}} = \frac{2}{3^{0} \cdot 5^{0}} = 2$

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