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b) √216 = √36x6 = 6√6
c) √605 =√121x5 = 11√5
d) √800 = √400x2 = 20√2
e) √5.000 = √2.500x2 = 50√2
f) √0,000121 = √121/1.000.000 = 11/1.000 = 0,011
g) √0,00000324 = √324/100.000.000 = 18/10.000 = 0,0018
h) 9√2 + √72 - √578 = 9√2 + 6√2 - 17√2 = -2√2
i) 7√3 + √48 - √768 = 7√3 + 4√3 - 16√3 = -5√3
j) 9√5 - √125 + √720 = 9√5 - 5√5 + 12√5 = 16√5