Question

tính (căn 7 + căn 5) x (căn 7 + căn 5)

Answer 1

giúp mình với ạ :<<

 

Answer 2

\(\left(\sqrt{7}+\sqrt{5}\right)\cdot\left(\sqrt{7}+\sqrt{5}\right)\)

\(=\left(\sqrt{7}+\sqrt{5}\right)^2\)

\(=7+2\sqrt{35}+5\)

\(=12+2\sqrt{35}\)

Answer 3

\(\left(\sqrt{7}+\sqrt{5}\right)\left(\sqrt{7}+\sqrt{5}\right)\)

\(=\left(\sqrt{7}+\sqrt{5}\right)^2\)

\(=12+2\sqrt{35}\)