a) 5^(2/3) * 2^(2/3) * 2^(7/3)/ 5^(1/3) = 2^(9/3) * 5^(3/3) = 2^3 * 5^1 = 8 * 5 = 40
2. а) b(7/2 - 4 - 1/2) = b(6/2 - 4) = b(3 - 4) = 1/b
3. (n - 16n^(1/2))/(6n^(1/4) + 24) = n^(1/2)(n^(1/2) - 16)/6(n^(1/4) + 4) = n^(1/2)(n^1/4 - 4)(n^1/4 + 4)/6(n^(1/4) + 4) = n^(1/2)(n^1/4 - 4)/6