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= 2.2√10+(3-5).√15
= 4√10 - 2√15
atau
= 2.(2√10-√15)
2) 15/(2+√3) . (2-√3)/(2-√3)
= 15.2+15.(-√3) / 2.2 - √3.(-√3)
= 30-15√3 / 4-3
= 30-15√3 / 1
= 30-15√3