\(\left(\dfrac{\sqrt{7}-1}{\sqrt{21}-\sqrt{3}}+\dfrac{\sqrt{3}-1}{\sqrt{21}-\sqrt{7}}\right)\times\dfrac{\sqrt{21}}{\sqrt{7}+\sqrt{3}}\)
\(\left(3\sqrt{5}+2\sqrt{6}+\sqrt{69}\right)\times\left(3\sqrt{5}+2\sqrt{6}-\sqrt{69}\right)\)
Tính
Tính
a. \(\sqrt{2}\left(\sqrt{21}+3\right)\sqrt{5-\sqrt{21}}\)
b. \(\sqrt{2}\left(\sqrt{5}-1\right)\sqrt{3+\sqrt{5}}\)
\(\left(\sqrt{3+\sqrt{5}}\right)\times\left(\sqrt{10}+\sqrt{2}\right)\times\left(3-\sqrt{5}\right)\)
Tính
thực hiện phép tính:
\(\left(\sqrt{3}-2\right)\times\left(\sqrt{6}+\sqrt{2}\right)\sqrt{2+\sqrt{3}}\)
\(\sqrt{\frac{\sqrt{5}}{8\sqrt{5}+3\sqrt{35}}}\times\left(3\sqrt{2}+\sqrt{14}\right)\)
CMR:
Q = \(\frac{1}{2+\sqrt{3}}+\sqrt{3}-1+\sqrt{\left(3+2\sqrt{2}\right).\left(3-2\sqrt{2}\right)}\)
M = \(\left(5+\sqrt{21}\right).\left(\sqrt{14}-\sqrt{6}\right).\sqrt{5-\sqrt{21}}\)
N = \(\frac{\sqrt{\sqrt{5}+2}+\sqrt{\sqrt{5}-2}}{\sqrt{2}}-\sqrt{\sqrt{5}+1}\)
Là số nguyên.
Thực hiện phép tính và thu gọn biểu thức:
B= \(\left(\dfrac{4}{1-\sqrt{5}}+\dfrac{1}{2+\sqrt{5}}-\dfrac{4}{3-\sqrt{5}}\right)\left(\sqrt{5}-6\right)\)
Thực hiện phép tính:
\(\sqrt{48}-\dfrac{\sqrt{21}-\sqrt{15}}{\sqrt{7}-\sqrt{5}}+\dfrac{2}{\sqrt{3}+1}\)
Bài 1: Thực hiện phép tính:
a, \(\left(\sqrt{24}-\sqrt{48}-\sqrt{6}\right)\sqrt{6}+12\sqrt{2}\)
b, \(\left(\sqrt{\dfrac{1}{5}}-\sqrt{\dfrac{16}{5}}+\sqrt{5}\right):\sqrt{20}\)
c, \(\sqrt{21+3\sqrt{48}}-\sqrt{21-3\sqrt{48}}\)
Bài 2: Giải các phương trình sau:
a, \(\dfrac{1}{3}\sqrt{x-2}-\dfrac{2}{3}\sqrt{9x-18}+6\sqrt{\dfrac{x-2}{81}}=-4\)
b, \(\sqrt{9x^2+12x +4}=4x\)
c, \(\sqrt{x-2\sqrt{x-1}}=\sqrt{x-1}\)
GIÚP MIK VỚIIII
Rút gọn
\(\sqrt{5+\sqrt{21}}+\sqrt{5-\sqrt{21}}-2\sqrt{4\sqrt{7}}\)\(\sqrt{8+\sqrt{55}}-\sqrt{8-\sqrt{55}}-\sqrt{125}\)\(\left(\sqrt{14}-\sqrt{10}\right)\left(6-\sqrt{35}\right)\sqrt{6+\sqrt{35}}\)\(\left(\sqrt{2}+1\right)\left(\sqrt{3}-1\right)\left(\sqrt{6}+1\right)\left(5-2\sqrt{2}-\sqrt{3}\right)\)\(\sqrt{7-3\sqrt{5}}\left(7+3\sqrt{5}\right)\left(3\sqrt{2}+\sqrt{10}\right)\)