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6. 2-√5 per 2+√5 dikali 2-√5 per 2-√5
= 4-4√5+√25 per 4-5
= 9-4√5 per -1 = -9-4√5
8. 3log18.4/8 = 3log9= 2
9. 12log15
=5log15 per 5log12
=5log3+5log5 per 5log3+5log4
=x+1 per x+y
segitu aja bisanya, maaf kl salah xx