Question

Tính:

Giup em voi ạ, em cảm ơn nhiều ạ.

 

Answer 1

\(H=\left(\sqrt{5}-2\right)^2.\left(\sqrt{5}+2\right)^2\)

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

\(H=\left[\left(\sqrt{5}\right)^2-2^2\right].\left[\left(\sqrt{5}\right)^2-2^2\right]\)

\(H=1.1=1\)

Answer 2

\(I=\left(11-4\sqrt{3}\right)\left(11+4\sqrt{3}\right)\)

\(I=11^2-\left(4\sqrt{3}\right)^2\)

\(I=121-48=73\)