Question

rút gon biểu thức

\(A=\frac{2}{\sqrt{x}-1}+\frac{2x-\sqrt{x}}{\sqrt{x}-x}\)

\(B=\left(\frac{1}{\sqrt{a}-2}-\frac{2}{a-2\sqrt{a}}\right)\left(\frac{a-3\sqrt{a+2}}{\sqrt{a}-2}+1\right)\)

Answer 1

\(=\frac{2}{\sqrt{x}-1}-\frac{2\text{x}-\sqrt{x}}{\sqrt{x}\left(\sqrt{x}-1\right)}\)

\(=\frac{2\sqrt{x}-2\text{x}+\sqrt{x}}{\sqrt{x}\left(\sqrt{x}-1\right)}\)

\(=\frac{-2\text{x}+\sqrt{x}}{\sqrt{x}\left(\sqrt{x}-1\right)}\)

b/\(=\left(\frac{\sqrt{a}-2}{\sqrt{a}\left(\sqrt{a}-2\right)}\right).\left(\frac{a-3\sqrt{a+2}+\sqrt{a}-2}{\sqrt{a}-2}\right)\)

\(=\frac{a-3\sqrt{a+2}+\sqrt{a}-2}{a-2\sqrt{a}}\)

tick cho mình nha bạn