a)\(2\sqrt{18}-7\sqrt{2}+\sqrt{162}\)=6\(\sqrt{2}\)-7\(\sqrt{2}+9\sqrt{2}=8\sqrt{2}\)
b)\(\sqrt{8-2\sqrt{15}}\)+\(\sqrt{4+2\sqrt{3}}\)=\(\sqrt{\left(\sqrt{3}-\sqrt{5}\right)^2}\)+\(\sqrt{\left(1+\sqrt{3}\right)^2}\)=\(\sqrt{3}-\sqrt{5}\)+\(1+\sqrt{3}\)
=2\(\sqrt{3}\)-\(\sqrt{5}\)+1
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