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a)
(3-√7)*(2+2√7) = 6+6√7-2√7-2*7 = 6-14-4√7 = -8-4√7
b)
∛7³ = 7
2.
√35 : √28 = √(35/28) = √(5/4) = √5/2
3∛5 * 7∛2 = 3*7*∛(5*2) = 21 ∛10