Question

[Die Devil]

\(\text{Rút gọn các căn thức sau:}\)

\(\sqrt{\frac{4}{\left(2-\sqrt{5}\right)^2}}-\sqrt{\frac{4}{\left(2+\sqrt{5}\right)^2}}\)

\(\left(2\sqrt{8}+3\sqrt{5}-7\sqrt{2}\right)\left(\sqrt{72}-5\sqrt{20}-2\sqrt{2}\right)\)

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

\(\sqrt{3+2\sqrt{2}}+\sqrt{6-4\sqrt{4}}\)

K lm tắt nhé !

Answer 1

[OoO_Nhok_Lạnh_Lùng_OoO]

mik làm bài này

linh tinh

bn ơi

cho mik

xin 1 L-I-K-E

b,  
 
 
 
 

d, 
 
 
 
 
 
 
 
 
 

Answer 2

[Trịnh Thành Công]

\(\sqrt{\frac{4}{\left(2-\sqrt{5}\right)^2}}-\sqrt{\frac{4}{\left(2+\sqrt{5}\right)^2}}\)

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

 \(=\frac{2\left(\sqrt{5}+2\right)-2\left(\sqrt{5}-2\right)}{5-4}\)

\(=2\sqrt{5}+4-2\sqrt{5}+4\)

\(=8\)