=\(\dfrac{\left(x+\sqrt{x}\right)\left(\sqrt{x}+2\right)}{x-4}-\dfrac{\left(2\sqrt{x}-1\right)\left(\sqrt{x}-2\right)}{x-4}+\dfrac{x-6\sqrt{x}+4}{x-4}\)

=\(\dfrac{x\sqrt{x}+2x+2+\sqrt{x}}{x-4}=\dfrac{\left(\sqrt{x}+2\right)\left(x+1\right)}{\left(\sqrt{x}+2\right)\left(\sqrt{x}-2\right)}=\dfrac{x+1}{\sqrt{x}-2}\)

cho a,b,c là 3 cạnh của 1 tam giac . CMR

\(\dfrac{a^2+b^2-c^2}{2ab}+\dfrac{b^2+c^2-a^2}{2bc}+\dfrac{c^2+a^2-b^2}{2ca}>1\)

DM=\(\dfrac{120}{17}\)

giai phuong trinh \(3\sqrt{x^2+5}-\sqrt{x^2+2x-4}=11-2x\)

giai phuong trinh \(\sqrt{x^2+5}-\sqrt{x^2+2x-4}=11-2x\)

loaij

\(x=\dfrac{4}{25}\)

x=0

giai pt \(\sqrt{x^2+5}-\sqrt{x^2+2x-4}=11-2x\)