Question

[Nguyễn Thu Thuỷ]

giúp với :>

Answer 1

[1 BÙI NGỌC ANH]

xin loi chi em moi lop 5

Answer 2

[Nguyễn Huy Tú]

Bài 4 : 

a, \(\sqrt{\left(4-3\sqrt{2}\right)^2}=4-3\sqrt{2}\)

b, \(\sqrt{6-2\sqrt{5}}=\sqrt{\left(\sqrt{5}-1\right)^2}=\sqrt{5}-1\)

e, \(\frac{\sqrt{2}-\sqrt{11+6\sqrt{2}}}{\sqrt{6+2\sqrt{5}}-\sqrt{5}}=\frac{\sqrt{2}+\sqrt{3^2+2.3\sqrt{2}+2}}{\sqrt{\left(\sqrt{5}+1\right)^2}-\sqrt{5}}\)

\(=\frac{\sqrt{2}+3+\sqrt{2}}{\sqrt{5}+1-\sqrt{5}}=3+2\sqrt{2}\)

h, \(\sqrt{6+2\sqrt{4-2\sqrt{3}}}=\sqrt{6+2\sqrt{\left(\sqrt{3}-1\right)^2}}\)

\(=\sqrt{6+2\left(\sqrt{3}-1\right)}=\sqrt{4+2\sqrt{3}}=\sqrt{\left(\sqrt{3}+1\right)^2}=\sqrt{3}+1\)