\(a,=5\sqrt{2}-3\sqrt{2}+6\sqrt{2}=8\sqrt{2}\\ b,=\dfrac{5\sqrt{3}}{3}-\dfrac{2\left(\sqrt{3}-1\right)}{2}=\dfrac{5\sqrt{3}}{3}-\sqrt{3}+1=\dfrac{5\sqrt{3}-3\sqrt{3}+3}{3}=\dfrac{2\sqrt{3}+3}{3}\)
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