Question

A=1/căn 5 +2   - căn9 +4 căn 5 

Tính A= ?

Answer 1

\(A=\frac{1}{\sqrt{5+2}}-\sqrt{9+4\sqrt{5}}\)

\(A=\frac{1}{\sqrt{7}}-3+8,94427191\)

\(A=0,377964473-11,94427191\)

\(A=-11,56630744\)

Ko chắc đâu nha

Answer 2

\(A=1\sqrt{5}+2-\sqrt{9}+4\sqrt{5}\)

\(A=\sqrt{5}+2-3+4\sqrt{5}\)

\(A=5\sqrt{5}-1\)

Vậy \(A=5\sqrt{5}-1\)

Answer 3

A=1 phần căn 5 +2   - căn 9 tất cả + 4 căn 5  

Answer 4

\(A=\frac{1}{\sqrt{5}+2}-\sqrt{9}+4\sqrt{5}\)

\(A=\frac{1}{\sqrt{5}+2}-3+4\sqrt{5}\)

\(A=\frac{1}{\sqrt{5}+2}-\frac{3\left(\sqrt{5}+2\right)}{\sqrt{5}+2}+\frac{4\sqrt{5}\left(\sqrt{5}+2\right)}{\sqrt{5}+2}\)

\(A=\frac{1-3\sqrt{5}-6+20+8\sqrt{5}}{\sqrt{5}+2}\)

\(A=\frac{15+5\sqrt{5}}{\sqrt{5}+2}\)