\(M=\dfrac{x-2\sqrt{x}-x-4}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}:\dfrac{2\sqrt{x}-1-\sqrt{x}+2}{\sqrt{x}\left(\sqrt{x}-2\right)}\\ M=\dfrac{-2\left(\sqrt{x}+2\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\cdot\dfrac{\sqrt{x}\left(\sqrt{x}-2\right)}{\sqrt{x}+1}\\ M=\dfrac{-2\sqrt{x}}{\sqrt{x}+1}\)
a: \(2\sqrt{48}+\dfrac{2}{5}\sqrt{75}-\dfrac{1}{3}\sqrt{243}-\sqrt{108}\)
\(=8\sqrt{3}+2\sqrt{3}-3\sqrt{3}-6\sqrt{3}\)
\(=\sqrt{3}\)
b: \(\dfrac{\sqrt{27}-3\sqrt{2}}{\sqrt{3}-\sqrt{2}}+\dfrac{12}{3+\sqrt{3}}+\dfrac{6}{\sqrt{3}}\)
\(=3+6-2\sqrt{3}+2\sqrt{3}\)
=09
Cho 3 số dương a,b,c thỏa mãn a+b+c=1. CMR:
