Jawabanmu

2014-09-05T08:42:20+07:00
(9+akar5)(2akar 5 +1) / (akar 5+1) . akar 5-1/akar 5-1
= (18akar 5+9+10+akar 5)(akar 5-1)/5-1
=(90-18akar 5+19akar 5-19+5-akar5)/4
= 76 /4= 19