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phmtun12
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Rút gọn các biểu thức
a, [TEX]( 2\sqrt{3} + \sqrt{5} ) \sqrt{3} - \sqrt{60}[/TEX]
b ,[TEX](\sqrt{28} - \sqrt{12 } - \sqrt{7}) \sqrt{7} +2\sqrt{21}[/TEX]
c , [TEX]2\sqrt{40.\sqrt{12}} - 2\sqrt{\sqrt{75}} - 3\sqrt{5\sqrt{48}}[/TEX]
a, [TEX]( 2\sqrt{3} + \sqrt{5} ) \sqrt{3} - \sqrt{60}[/TEX]
b ,[TEX](\sqrt{28} - \sqrt{12 } - \sqrt{7}) \sqrt{7} +2\sqrt{21}[/TEX]
c , [TEX]2\sqrt{40.\sqrt{12}} - 2\sqrt{\sqrt{75}} - 3\sqrt{5\sqrt{48}}[/TEX]
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