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= - 13√5
4) 4√3 + 3√12 - √27 = 4√3 + 3 .√4 .√3 - √9 .√3
= 4√3 + 3 .3 .√3 - 3√3
= 4√3 + 9√3 - 3√3
= (4 + 9 - 3)√3
= 10√3
5) (3√2 + 2√3) (3√2 - 2√3) = (3√2)² - (2√3)²
= 18 - 12
= 6
6) 9 / (√5 - √2) = 9 / (√5 - √2) x (√5 + √2) (√5 + √2)
= 9 (√5 + √2) / (5 - 2)
= 9 (√5 + √2) / 3
= 3 (√5 + √2)
7) soal tak terbaca (terpotong)