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= [(6√5 + 3√10 - 2√15 - √30) - (2√5 + 3√10 - 2√15 - 3√30)]/(2 + √6)
= (4√5 + 2√30)/(2 + √6) . (2 - √6)/(2 - √6)
= (8√5 - 4√30 + 4√30 - 2√180) / (4 - 6)
= (8√5 - 2√36.√5) / (-2)
= (8√5 - 6√5)/(-2)
= 2√5/(-2)
= -√5
-√5 < -√4 atau -√4 > -√5
jadi bilangan bulat terkecil yg lebih besar dr -√5 adalah -√4 = -2