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Rút gọn : 1. $\sqrt[n]{7-2 √10}$ – $\sqrt[n]{ √49}$ + $\sqrt[n]{12-2 √35}$ 2. $\sqrt[n]{42-10 √17}$ + $\sqrt[n]{33-8 √17}$ 3. $\frac{4}{ √7 – √
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