bài 1:
a) \(\sqrt{4-2\sqrt{3}}\) -\(\sqrt{3}\) b) \(\sqrt{10-2\sqrt{21}}\) +\(\sqrt{7}\)
c) \(\sqrt{6-4\sqrt{2}-}\sqrt{10}\) d) \(\sqrt{4-2\sqrt{28}}\) +2
bài 2: rút gọn bt
a) \(\sqrt{12-6\sqrt{3}}-3\) b) \(\sqrt{7+2\sqrt{6}}-\sqrt{3}\)
c) \(\sqrt{11-2\sqrt{10}}-\sqrt{10}\) d) \(\sqrt{9-2\sqrt{20}}+\sqrt{5}\)