P = \(1\)- (\(3\sqrt{5}\) -\(2\)\(\sqrt{5}\) -\(\sqrt{3}\) )(\(2\sqrt{5}-3\sqrt{5}-\sqrt{3}\))
= 1- (\(\sqrt{5}-\sqrt{3}\) )(\(-\sqrt{5}-\sqrt{3}\) )
= 1+ ( \(\sqrt{5}-\sqrt{3}\) )( \(\sqrt{5}+\sqrt{3}\) )
= 1+ (5-3)
= 3
P = \(1\)- (\(3\sqrt{5}\) -\(2\)\(\sqrt{5}\) -\(\sqrt{3}\) )(\(2\sqrt{5}-3\sqrt{5}-\sqrt{3}\))
= 1- (\(\sqrt{5}-\sqrt{3}\) )(\(-\sqrt{5}-\sqrt{3}\) )
= 1+ ( \(\sqrt{5}-\sqrt{3}\) )( \(\sqrt{5}+\sqrt{3}\) )
= 1+ (5-3)
= 3
rút gọn các biểu thức sau:
\(\dfrac{1}{2}\sqrt{20}+5\)
\(\sqrt{16}+\sqrt{64}\)
\(\sqrt{20}-\sqrt{45}+3\sqrt{18}\)
\(\sqrt{\left(2-\sqrt{2}\right)^2}+\sqrt{2}\)
A= \(\dfrac{2}{\sqrt{7}-5}-\dfrac{2}{\sqrt{7}+5}\)
B=\(\dfrac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\dfrac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\)
mình cần gấp á. tại vì mình khá là ngu toán nên giúp mik vs
a,\(\dfrac{1}{4}\sqrt{180}+\sqrt{20}-\sqrt{45}+5\)
b,\(3\sqrt{\dfrac{1}{3}}+\dfrac{1}{4}\sqrt{48}-2\sqrt{3}\)
rút gọn
a.\(5\sqrt{\dfrac{1}{5}}+\dfrac{1}{2}\sqrt{20}+\sqrt{5}\)
b.\(\sqrt{\dfrac{1}{2}}+\sqrt{4,5}+\sqrt{12,5}\)
c.\(\sqrt{20}-\sqrt{45}+3\sqrt{18}+\sqrt{72}\)
d.\(0,1.\sqrt{200}+2.\sqrt{0,08}+0,4.\sqrt{50}\)
Rút gọn các biểu thức sau :
a) \(5\sqrt{\dfrac{1}{5}}+\dfrac{1}{2}\sqrt{20}+\sqrt{5}\)
b) \(\sqrt{\dfrac{1}{2}}+\sqrt{4,5}+\sqrt{12,5}\)
c) \(\sqrt{20}-\sqrt{45}+3\sqrt{18}+\sqrt{72}\)
d) \(0,1\sqrt{200}+2.\sqrt{0,08}+0,4.\sqrt{50}\)
\(\sqrt{4x-20}+3\sqrt{\dfrac{x-5}{9}}-\dfrac{1}{3}\sqrt{9x^2-45}=4\)
Tìm x?
Đề bài: Khử mẫu của biểu thức dưới căn:
1. \(\frac{5\sqrt{5}+3\sqrt{3}}{\sqrt{3}+\sqrt{5}}\)
2. \(\frac{3+4\sqrt{3}}{\sqrt{6}+\sqrt{2}-\sqrt{5}}\)
3. \(\sqrt{\frac{3}{20}}\) + \(\sqrt{\frac{1}{60}}\) - 2\(\sqrt{\frac{1}{15}}\)
4. 2\(\sqrt{40\sqrt{12}}\) - 2\(\sqrt{\sqrt{75}}\) - 3\(\sqrt{5\sqrt{48}}\)
5. 2\(\sqrt{45\sqrt{3}}\) - 2\(\sqrt{20\sqrt{3}}\) - \(\sqrt{5\sqrt{48}}\)
Các bác giúp e vs, hứa sẽ tick, e cảm ơn!!!!!!
Rút gọn các biểu thức sau:
a) \(\sqrt{20}-\sqrt{45}+3\sqrt{18}+\sqrt{72}\)
b) \(\left(\sqrt{28}-2\sqrt{3}+\sqrt{7}\right)\sqrt{7}+\sqrt{84}\)
c) \(\left(\sqrt{6}+\sqrt{5}\right)^2-\sqrt{120}\)
d) \(\left(\dfrac{1}{2}-\sqrt{\dfrac{1}{2}}-\dfrac{3}{2}\sqrt{2}+\dfrac{4}{5}\sqrt{200}\right):\dfrac{1}{8}\)
giúp nha
Thực hiện các phép tính:
a. \(2\sqrt{16}+\sqrt{2}.\sqrt{0,02}-\dfrac{\sqrt{12,1}}{\sqrt{0,1}}\)
b. \(5\sqrt{20}-4\sqrt{45}+\dfrac{15}{\sqrt{5}}\)
\(\dfrac{1}{\sqrt{49+20\sqrt{6}}}-\dfrac{1}{\sqrt{49-20\sqrt{6}}}+\dfrac{1}{\sqrt{7-4\sqrt{3}}}\)