căn bậc 2

H

hthtb22

[tex]\sqrt{2}+\sqrt{3}+\sqrt{6}+\sqrt{8}+4[/tex]
=[tex](\sqrt{2}+\sqrt{3}+2)+(2+\sqrt{6}+\sqrt{8})[/tex]
=[tex](\sqrt{2}+\sqrt{3}+\sqrt{4})+(\sqrt{4}+\sqrt{6}+ \sqrt{8})[/tex]
=[tex](\sqrt{2}+\sqrt{3}+\sqrt{4})+\sqrt{2}(\sqrt{2}+ \sqrt{3}+ \sqrt{4})[/tex]
=[tex](\sqrt{2}+1)(\sqrt{2}+\sqrt{3}+\sqrt{4})[/tex]
Vậy biểu thức cần tính =
[tex]\sqrt{2}+1[/tex]
 
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