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2. 3akar 5 + 4 akar 5 -akar 5 = (3+4-1) akar 5 = 6 akar 5
3.akar 99 + 7akar 11 = 3 akar 11 + 7 akar 11 =(3+7) akar 11 =10 akar 11
= 5 × 5 lg 5
= 5 × 1
= 5
2) 3√5 + 4√5 - √5 = (3 + 4 - 1) √5
= 6√5
3) √99 + 7√11 = 3√11 + 7√11
= (3 + 7) √11
= 10√11