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soal 6 /√8+√5
= 6 /√8+√5
= (6 /√8+√5)x(√8-√5)/ (√8-√5)
= (6 (√8-√5) /√8+√5)x(√8-√5)
(a+b)(a-b)=a²-b²
= 6 (√8-√5) /8-5
= 6 (√8-√5) /3
=2 (√8-√5)