Question

5/(√7+√2) - √(8-2√7) +√2

Answer 1

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

Answer 2

chơi sửa đề z ai chs

\(=\dfrac{5\left(\sqrt{7}-\sqrt{2}\right)}{5}-\sqrt{\left(\sqrt{7}-1\right)^2}+\sqrt{2}\\ =\sqrt{7}-\sqrt{2}-\sqrt{7}+1+\sqrt{2}=1\)