Упростите выражения
a*45^1/2 / (5a)^1/2 = ( (a^2 * 5 * 3^2) : (5a) )^1/2 = 3a^1/2
(91ab)^1/2 : (13a)^1/2 = ( (7 * 13 * ab) : 13a )^1/2 = (7b)^1/2
(x - 49) : (x^1/2 - 7) = (x^1/2 - 7) * (x^1/2 + 7) : (x^1/2 - 7) = x^1/2 + 7