Question

Bài 1 câu 2 biểu thức nhaaaaa

Answer 1

\(R=\left(1+\dfrac{x+\sqrt{x}}{1+\sqrt{x}}\right).\left(1+\dfrac{x-\sqrt{x}}{1-\sqrt{x}}\right)\)

\(ĐK:x\ge0;x\ne1\)

\(R=\left(1+\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)}{1+\sqrt{x}}\right).\left(1+\dfrac{\sqrt{x}\left(\sqrt{x}-1\right)}{1-\sqrt{x}}\right)\)

\(R=\left(1+\sqrt{x}\right)\left(1-\sqrt{x}\right)\)

\(R=1-x\)

\(x=-5\)

\(\Rightarrow R=1-\left(-5\right)=6\)

Nhưng \(x\ge0\) \(\Leftrightarrow\) R vô nghĩa