viết lại nhá
[TEX](\sqrt{11+2\sqrt{30}}-\sqrt{8-4\sqrt{3}}).(\sqrt{5}- \sqrt{3})[/TEX]
cái đề thế này đc chưa ?
[TEX](\sqrt{11+2\sqrt{30}}-\sqrt{8-4\sqrt{3}}).(\sqrt{5}- \sqrt{3})[/TEX]
[TEX]=(\sqrt{6+2.\sqrt{6}.\sqrt{5}+5}-\sqrt{6+2.\sqrt{6}.\sqrt{2}+2})(\sqrt{5}-\sqrt{3})[/TEX]
[TEX]=(\sqrt{(\sqrt{6}+\sqrt{5})^2}-\sqrt{(\sqrt{6}-\sqrt{2})^2})(\sqrt{5}-\sqrt{3})[/TEX]
[TEX]=(|\sqrt{6}+\sqrt{5}|-|\sqrt{6}-\sqrt{2}|)(\sqrt{5}-\sqrt{3})[/TEX]
[TEX]=(\sqrt{6}+\sqrt{5}-\sqrt{6}+\sqrt{2})(\sqrt{5}-\sqrt{3})[/TEX]
[TEX]=(\sqrt{5}+\sqrt{2})(\sqrt{5}-\sqrt{3})[/TEX]