\(\left(1+\sqrt{1993}\right).\sqrt{1994-2\sqrt{1993}}\)
\(=\left(1+\sqrt{1993}\right).\sqrt{\left(\sqrt{1993}\right)^2-2.\sqrt{1993}+1}\)
\(=\left(1+\sqrt{1993}\right).\sqrt{\left(\sqrt{1993}-1\right)^2}\)
\(=\left(1+\sqrt{1993}\right).\left(\sqrt{1993}-1\right)\)
\(=1992\)
ai tích mình mình tích lại cho