mohon bantuanya semua....

15/√75 - 1/(2-√3)
= 15/5√3 - 1/(2-√3)
= 3/√3 - 1/(2-√3)
= (3(2-√3) - √3) / (√3(2-√3))
= (6 - 3√3 - √3) / (2√3 - 3)
= (6 - 2√3) / (2√3 - 3)
rasionalkan
= (6 - 2√3)/(2√3 - 3) × (2√3+3)/(2√3+3)
= (12√3 - 4(3) + 18 - 6√3) / (4(3) - 9)
= (6√3 + 6) / (3)
= 2√3 + 2
= 2(√3 + 1)