F=(\(\dfrac{1}{3-\sqrt{5}}\) +\(\dfrac{1}{3+\sqrt{5}}\)) :\(\dfrac{5-\sqrt{5}}{\sqrt{5}-1}\)
G= \(\sqrt{3+\sqrt{5}}\) +\(\sqrt{7-3\sqrt{5}}\) -\(\sqrt{2}\)
H=\(\sqrt{x+2\sqrt{2x-4}}\) +\(\sqrt{x-2\sqrt{2x-4}}\) với x> hoặc bằng 2
Thực hiện pt
1.✓50(5+a)5 chú ý ✓ là căn bậc hai nha mn
2.✓x3(1-✓3)3 với x>3
3.✓(x-4)3(1-x)5 với 1<x<4
4.✓2 -✓8
5.✓2.✓8
1.√(3-√5) -√(3+√5)
2. √x +√4x =6
3. √(x+2)2 = 3
1) \(\dfrac{\sqrt{5}-\sqrt{3}}{\sqrt{2}}\)
2)\(\dfrac{\sqrt{x}+1}{\sqrt{x}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}+\dfrac{2+5\sqrt{x}}{4-x}\)
Giải phương trình: \(\sqrt{x+2+3\sqrt{2x-5}}+\sqrt{x-2-\sqrt{2x-5}}=2\sqrt{2}\)
\(a.\sqrt{4a^2}voi\:a\ge0\)
\(b.\sqrt{0,16\left(x-2\right)^2}voi\:x\ge2\)
\(c.\sqrt{25.\left(3-a\right)^2}+3\)
\(d.\frac{1}{2\left(x-5\right)}\sqrt{36.\left(x-5\right)^2}-5\:voi\:x\ne5\)
a, Tính: \(A=\dfrac{2}{2+\sqrt{5}}-\sqrt{9-2\sqrt{20}}+\sqrt[3]{5\sqrt{5}}\)
b, Cho biểu thức: \(B=\left(\dfrac{2}{2\sqrt{x}-1}+\dfrac{3}{\sqrt{x}+2}-\dfrac{2\sqrt{x}}{2x+3\sqrt{x}-2}\right).\dfrac{2\sqrt{x}-\sqrt{x}}{6\sqrt{x}+4}\) với \(\left\{{}\begin{matrix}x\ge0\\x\ne\dfrac{1}{4}\end{matrix}\right.\)
1) \(\dfrac{\sqrt{5}-\sqrt{3}}{\sqrt{2}}\)
2)\(\dfrac{\sqrt{x}+1}{\sqrt{x}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}+\dfrac{2+5\sqrt{x}}{4-x}\)
giải giùm mik bài này
Rút gọn
A=\(\sqrt{7}-4\sqrt{3}+\sqrt{4}-2\sqrt{3}\)
B=(\(2+\frac{5-\sqrt{5}}{\sqrt{5}-1}\)) (\(2-\frac{5+\sqrt{5}}{\sqrt{5}+1}\))
C=(\(\sqrt{3}+1\))\(\frac{\sqrt{14}-6\sqrt{3}}{5+\sqrt{3}}\)
Cho P=(\(\sqrt{x}-\frac{1}{\sqrt{x}}):\frac{\sqrt{x}-1}{\sqrt{x}}+\frac{1-\sqrt{x}}{x+\sqrt{x}}\))
a)CmR: P >0,V x>o, x≠1
b) Tính P khi x=\(\frac{2}{2+\sqrt{3}}\)
c)Tìm x để P\(\sqrt{x}\) =6\(\sqrt{x}\) - 3-\(\sqrt{x}-4\)