Trục căn thức ở mẫu và rút gọn
a, (\(\frac{15}{\sqrt{6}+1}+\frac{4}{\sqrt{6}-2}-\frac{12}{3-\sqrt{6}}\))(\(\sqrt{6} +11\))
b,(\(1-\frac{5+\sqrt{5}}{1+\sqrt{5}}\))(\(\frac{5-\sqrt{5}}{1-\sqrt{5}}-1\))
c,\(\frac{3+2\sqrt{3}}{\sqrt{3}}+\frac{2+\sqrt{2}}{\sqrt{2}+1}\)- (\(\sqrt{2}+\sqrt{3}\))
d,(\(\frac{5-2\sqrt{5}}{2-\sqrt{5}}-2\))(\(\frac{5+3\sqrt{5}}{3+\sqrt{5}}-2\))
Giải phương trình
a,\(\sqrt{x^2+x-20}=\sqrt{x-4}\)
b,\(\sqrt{x+1}+\sqrt{2-x}=\sqrt{6}\)
c,\(\sqrt{x+2\sqrt{x-1}=2}\)
d,\(\sqrt{2x-2+2\sqrt{2x-3}+}\sqrt{2x+13+8\sqrt{2x-3}=}5\)
e, \(\sqrt{x^2-1}-x^2+1=0\)
f,\(\sqrt{x^2-9}+\sqrt{x^2-6x+9}=0\)
g,\(\sqrt{x^2-2x+1}+\sqrt{x^2-4x+4}=3\)