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B = 7 √45 - 6 √20 + √5

B = 7 √5 x √9 - 6 √ 5 x √4 + √5

B =  21 √5 -  12 √5 + √5 =  10 √5

A = √27  = √3 x √9 = 3 √3

B = √300 / 5 =   10√3 / 5 = 2 √3

C = √42 / √7 =  √ 6

D = √2 x √6 = √ 12 =  2 √3

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