\(< =>3\sqrt{2x}-5\sqrt{2^2.2x}+7\sqrt{3^2.2x}=28\)
\(< =>3\sqrt{2x}-10\sqrt{2x}+21\sqrt{2x}=28\)
\(< =>14\sqrt{2x}=28\)
\(< =>\sqrt{2x}=\dfrac{28}{14}=2=\sqrt{4}\)
\(< =>\sqrt{2x}=\sqrt{2.2}=>x=2\)
Giải phương trình
\(\sqrt{3x^2-18x+28}+\sqrt{4x^2-24x+45}=-5-x^2+6\)
B1: rút gọn:
a, \(\sqrt{4-2\sqrt{3}}-\sqrt{3}\)
b, \(\sqrt{11+6\sqrt[]{2}}-3+\sqrt{2}\)
c, \(x-4+\sqrt{16-8x+x^2}\) với x > 4
d, \(\dfrac{x^2-5}{x+\sqrt{5}}\) x khác \(-\sqrt{5}\)
e, \(\dfrac{x^2+2\sqrt{2}x+2}{x+\sqrt{2}}\) x khác \(-\sqrt{2}\)
g, \(\dfrac{\sqrt{6}+\sqrt{14}}{2\sqrt{3}+\sqrt{28}}\)
giúp em với ạ , em cảm ơn 
giải pt
a)\(\sqrt{\dfrac{2x-3}{x-1}}=2\)
b)\(\dfrac{\sqrt{2x-3}}{\sqrt{x-1}}=2\)
c)\(\sqrt{4x^2-9}=2\sqrt{2x+3}\)
d)\(\dfrac{9x-7}{\sqrt{7x+5}}=\sqrt{7x+5}\)
e)\(\sqrt{4x-20}+3\sqrt{\dfrac{x-5}{9}}-\dfrac{1}{3}\sqrt{9x-45}=4\)
Giúp mình nhé
Bài: Giải pt:
a) \(\sqrt{X^2-9}-\sqrt{4x-12}=0\)
b) \(\sqrt{1-x}+\sqrt{x}=1\)
c) \(\sqrt{x+3}+\sqrt{x+8}=5\)
d) \(\sqrt{16-32x}-\sqrt{12x}=\sqrt{3x}+\sqrt{9-18x}\)
Tìm x:
a) \(\sqrt{x+\sqrt{2x-1}}\) + \(\sqrt{x-2\sqrt{2x-1}}\) =\(\sqrt{2}\)
b) \(\sqrt{x+2+3\sqrt{2x-5}}\) + \(\sqrt{x-2-\sqrt{2x-5}}\) = \(2\sqrt{2}\)
tìm x, biết
a, \(\sqrt{x-2}\) = 4
b, \(\sqrt{x-5}\) = -3
c, \(\sqrt{2x+3}\) \(\sqrt{7}\)
c,\(\sqrt{3-x}=3x-5\)
\(d,\sqrt{2x-3}=\sqrt{x-1}\)
b5: giải pt ;
a, \(\sqrt{49\left(1-2x+x^2\right)}-35=0\)
b, \(\sqrt{x^2-9}-5\sqrt{x+3}=0\)
c, \(\dfrac{\sqrt{x}-2}{\sqrt{x}+1}=\dfrac{\sqrt{x}-1}{\sqrt{x}+3}\)
LGiải các pt:
a) \(\sqrt{2x+5}\)=5
b) \(\sqrt{x-7}+3=0\)
c) \(\sqrt{3x+1}=\sqrt{10}\)
d) \(\sqrt{16-7x}=11\)