Câu 1:
a: \(2\sqrt{18}-\dfrac{1}{5}\sqrt{50}+3\sqrt{98}-\sqrt{288}\)
\(=6\sqrt{2}-\sqrt{2}+21\sqrt{2}-12\sqrt{2}\)
\(=14\sqrt{2}\)
b: \(\sqrt{\left(1-\sqrt{3}\right)^2}+\sqrt{7-4\sqrt{3}}\)
\(=\sqrt{3}-1+2-\sqrt{3}\)
=1
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