( 2^4/7 9^2/3)^21 /18^13

Находим значение последующего выражения.
( 2^4/7 9^2/3)^21 /18^13 = (2^4/7 (3^2)^2/3)^21/(3^22)^13 = (2^4/7 3^4/3)^21/(3^262^13) = (2^4/7 3^(4-1))^21/(3^262^13) = (2^4/7 3^3)^21/(3^262^13) =( 2^84/7^21 3^63)/(3^262^13) = 2^(84-13)3^(63-26)/7^21 = 2^71 3^37/7^21.