\(\dfrac{7-\sqrt{7}}{\sqrt{7}-1}-\dfrac{\sqrt{7}+7}{1+\sqrt{7}}=\dfrac{\sqrt{7}\left(\sqrt{7}-1\right)}{\sqrt{7}-1}-\dfrac{\sqrt{7}\left(1+\sqrt{7}\right)}{1+\sqrt{7}}\)
\(=\sqrt{7}-\sqrt{7}=0\)
Đúng 1
Bình luận (0)