1)7+√5+2(7-√5)+ ((7-√5)^2)/(7+√5) = 7+√5+14-2√5+(49-14√5+5)/(7+√5) = 21-√5+ (49-14√5+5)/(7+√5) = ((21-√5)*(7+√5)+49-14√5+5)/(7+√5) = 196/(7+√5)
2)1+(7-√5)/(7+√5) = (7+√5+7-√5)/(7+√5) = 14/(7+√5)
3)196/(7+5) * (7+√5)/14 = 196/14 = 14
Таким образом ответ 14.