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Rút Gọn
A. \(\left(\sqrt{28}-2\sqrt{14}+\sqrt{7}\right)\)\(\sqrt{7}\)+\(7\sqrt{8}\)
B.\(\sqrt{16a}+2\sqrt{40a}-3\sqrt{90a}\)
C.\(\sqrt{\left(2\sqrt{6}-3\right)^2}+\sqrt{15-6\sqrt{6}}\)
D.\(\left(\sqrt{3}\right)+1\sqrt{4-2\sqrt{2}}\)
E.2\(2\sqrt{3}+\sqrt{48}-\sqrt{75}-\sqrt{243}\)
