a) \(\dfrac{a\sqrt{a}-8+2a-4\sqrt{a}}{a-4}\)

b) \(\dfrac{12\sqrt{6}}{\sqrt{7+2\sqrt{6}}-\sqrt{7-2\sqrt{6}}}\)

1) \(\sqrt{x^2-9}+\sqrt{x^2-6x+9}=0\)

2) \(\sqrt{2x-2+2\sqrt{2x-3}}+\sqrt{2x+13+8\sqrt{2x-3}}=5\)

1) \(\sqrt{x^2-4x+4}=\sqrt{4x^2-12x+9}\)

2) \(\sqrt{x+2\sqrt{x-1}}=2\)

rút gọn

a) \(\left(-7\sqrt{7}\right)\left(-2\sqrt{8}\right)\)

b) \(-\sqrt{33}.3\sqrt{3}\)

c) \(\left(3\sqrt{5}\right).\left(-10\sqrt{3}\right)\)

d) \(\dfrac{1}{2}\sqrt{5}.\left(-6\sqrt{2}\right)\)

e) \(\dfrac{2}{3}\sqrt{7}.\left(-\dfrac{9}{16}\sqrt{3}\right)\)

f) \(15\sqrt{6}:5\sqrt{3}\)

g) \(-25\sqrt{12}:\left(-5\sqrt{6}\right)\)

h) \(36\sqrt{8}:12\sqrt{2}\)

i) \(4\sqrt{27}:\left(-2\sqrt{3}\right)\)

a) x+\(\sqrt{\left(x-2\right)^2}\)

b) \(\sqrt{\left(x-3\right)^2}\) -x

c) x-\(\sqrt{\left(x-1\right)^2}\)

d) \(\sqrt{m^2-6m+9}\) -2m

e) m-\(\sqrt{m^2-2m+1}\)

f) 2x-\(\sqrt{4x^2+4x+1}\)

g)\(\sqrt{x^2-10x+25}\) -x

h) \(\dfrac{\sqrt{x^2+10x+25}}{x^2-25}\)

i) \(\dfrac{\sqrt{1-2m+m^2}}{m^2-1}\)

A=\(\dfrac{1+2+2^2+2^3+...+2^{2009}}{2^{2010}-1}\)

giải giúp mik câu c vs