Question

21. (2/7)^6×(7/3)^4×(1/7)^-2
22. (2-1÷3-1 )^ 2 × (-3/8)^-1
23. (52 ) ^3 × (5)^-2 ÷ (1/5)^-3​

Answer 1

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$( \frac{2}{7} ){}^{6} \times (\frac{7}{3} ) {}^{4} \times (\frac{1}{7} ) {}^{ - 2} \\ \frac{ {2}^{6} }{ {3}^{4} } \times {7}^{4 - 2 - 6} = \frac{64}{81} \times {7}^{ - 4}$

$\frac{64}{81 \times 2401} or \frac{ {2}^{6} }{ {3}^{4} \times {7}^{4} } \\ \frac{ {2}^{6} }{ {21}^{4} }$