(a^0.5-16b^0.5/a^0,25-4b^0.25)-4b^0.25

A^0.5-16b^0.5=(a^0,25-4b^0.25)*(a^0,25+4b^0.25)
тогда

(a^0,25-4b^0.25)*(a^0,25+4b^0.25)\a^0,25-4b^0.25= (a^0,25+4b^0.25)
(a^0,25+4b^0.25)-4b^0.25=a^0,25