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√5.√5 + √5.-√3 + √3.√5 + √3.-√3
√25 + -√15+√15 + -√9
5 + -3
2
5 + ( - √15 ) + √15 - 3
= 2
atau
√5 kuadrat - √3 kuadrat
= 5 - 3
= 2