Jawabanmu

2014-09-05T13:55:53+07:00
= 15/√75 - 1/(2-√3)
= (15x(2-√3) - (1x√75)/√75x(2-√3)
= (30-15√3) - (√75)/(2√75-√225)
= 30-15√3-5√3/(10√3-15)
= (30-20√3)/(10√3-15)
= 2(15-10√3)/-(15-10√3)
= -2