\(1,=10\sqrt{2}-21\sqrt{2}+3\sqrt{2}=-8\sqrt{2}\\ 2,=\dfrac{6\left(\sqrt{5}+1\right)}{4}=\dfrac{3\sqrt{5}+3}{2}\\ 3,=2+\left|2-\sqrt{7}\right|=2+\sqrt{7}-2=\sqrt{7}\)
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