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= √4•5 + √9•5 - √3•4•5
= 2√5 + 3√5 - 2√15
= 5√5 - 2√15
*angka kuadrat yg berada di dalam akar bisa dikeluarkan*
*pengoperasian penjumlahan + pengurangan dilakukan jika angka didalam akar sama*