Ответы и объяснения

2013-06-10T23:44:37+04:00

3((3-sqrt(5))/2)^2 - 6 ((3-sqrt5)/2) -3=

3((9-6sqrt(5) + 5)/4) - 6 ((3-sqrt5)/2) -3=

((27-18sqrt(5)+5)/4) -((18+6sqrt(5))/2)-3=

(27-18sqrt(5)+15-36-12sqrt(5)-12)/4=

(-3(1+5sqrt(5)))/4