\(\sqrt{6+2\sqrt{5}-\sqrt{29-12\sqrt{5}}}\)
\(=\sqrt{\left(\sqrt{5}+1\right)^2-\sqrt{\left(\sqrt{20}-3\right)^2}}\)
\(=\sqrt{\sqrt{5}+1-\sqrt{20}+3}\)
\(=\sqrt{\sqrt{5}+1-2\sqrt{5}+3}\)
\(=\sqrt{-\sqrt{5}+4}\)
Tính thu gọn :
a , \(\sqrt{17-12\sqrt{2}}-\sqrt{17+12\sqrt{2}}\)
b , \(\sqrt{27+12\sqrt{5}}-\sqrt{27-12\sqrt{5}}\)
c , \(\sqrt{15-6\sqrt{6}}+\sqrt{15+\sqrt{6\sqrt{6}}}\)
d , \(\sqrt{4+\sqrt{15}}+\sqrt{4-\sqrt{15}}-2\sqrt{3-\sqrt{5}}\)
e , \(\sqrt{17-3\sqrt{32}}+\sqrt{17+3\sqrt{32}}\)
f , \(\sqrt{5+\sqrt{3-\sqrt{29-12\sqrt{5}}}}\)
tính H = \(\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}}\)
1. so sánh
a. 3 + \(\sqrt{5}và\) \(\sqrt{2}+\sqrt{6}\) b. 2 + \(\sqrt{3}\) và \(\sqrt{5+4\sqrt{ }3}\)
c. \(\sqrt{5}+\sqrt{7}\) và \(\sqrt{12+2\sqrt{ }35}\) d. \(\sqrt{2013}\) + \(\sqrt{2015}\) và 2\(\sqrt{2014}\)
2.tính
a. \(\sqrt{14+6\sqrt{ }5}\) + \(\sqrt{14-6\sqrt{ }5}\) b. \(\sqrt{6+4\sqrt{ }2}+\sqrt{11-6\sqrt{ }2}\)
c. \(\sqrt{29-12\sqrt{ }5}-\sqrt{29+12\sqrt{ }5}\) d. \(\sqrt{30+10\sqrt{ }7}+\sqrt{30-10\sqrt{ }7}\)
e.\(\sqrt{30+12\sqrt{ }6}+\sqrt{30-12\sqrt{ }6}\) f. \(\sqrt{4+\sqrt{ }7}-\sqrt{4-\sqrt{ }7}-\sqrt{2}\)
Rút gọn:
a) \(\sqrt{\left(\sqrt{5}-\sqrt{2}\right)^2}-\sqrt{\left(\sqrt{5}+\sqrt{2}\right)^2}\).
b) \(\sqrt{\left(1-\sqrt{2}\right)^2}-\sqrt{\left(2-\sqrt{5}\right)^2}\).
c) \(\sqrt{46-6\sqrt{5}}-\sqrt{29-12\sqrt{5}}.\)
giai giups nhanh nha,RUT GON
A=\(\sqrt{4-\sqrt{7}}-\sqrt{4+\sqrt{7}}+\sqrt{7}\)
B=\(\sqrt{6.5+\sqrt{12}}+\sqrt{6.5-\sqrt{12}}+2\sqrt{6}\)
C=\(\sqrt{46+\sqrt{6\sqrt{5}}}-\sqrt{29-12\sqrt{5}}\)
D=\(\sqrt{13-\sqrt{160}}-\sqrt{53+4\sqrt{90}}\)
Bài 1: Rút gọn
a)\(\sqrt{4+\sqrt{10+2\sqrt{5}}}\)+\(\sqrt{4-\sqrt{10+2\sqrt{5}}}\) ,
b)\(\sqrt{4+\sqrt{15}}\)+\(\sqrt{4-\sqrt{15}}\)-\(2\sqrt{3-\sqrt{5}}\)
c)A=\(\sqrt{4+\sqrt{5\sqrt{3}+5\sqrt{48-10\sqrt{7+4\sqrt{3}}}}}\)
d)B=\(\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-8\sqrt{2}}}}}\)
e)C=\(\sqrt{\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}}}\)
f)D= \(\dfrac{\left(5+4\sqrt{6}\right)\left(49-20\sqrt{6}\right)\left(5-2\sqrt{6}\right)\sqrt{5-2\sqrt{6}}}{9\sqrt{3}-11\sqrt{2}}\)
\(\sqrt{46-6\sqrt{5}}-\sqrt{29-12\sqrt{5}}\) \(\sqrt{13-\sqrt{160}-\sqrt{53+4\sqrt{90}}}\) \(\left(\sqrt{3+}\sqrt{5}\right)\times\sqrt{7-2\sqrt{10}}\) \(\left(\sqrt{7}-\sqrt{3}\right)\times\sqrt{10+2\sqrt{21}}\)
Tính:
a.\(A=\sqrt{4+\sqrt{6-2\sqrt{5}}}\)
b.\(B=\sqrt{13+30\sqrt{2+\sqrt{9+4\sqrt{2}}}}\)
c.\(C=\sqrt{6+2\sqrt{5}-\sqrt{29-12\sqrt{5}}}\)
d.\(D=2\sqrt{4-\sqrt{5+\sqrt{21+\sqrt{80}}}}\)
Giúp em với ạ!
Rút gọn các biểu thức sau:
H = \(2\sqrt{27}+\sqrt{243}-6\sqrt{12}\)
I = \(\sqrt{14-2\sqrt{ }13}+\sqrt{14+2\sqrt{ }13}\)
K = \(\sqrt{10-\sqrt{ }4\sqrt{ }6}+\sqrt{10\sqrt{ }+4\sqrt{ }6}\)
(*)L = \(\sqrt{6+2\sqrt{ }5-\sqrt{ }29-12\sqrt{ }5}\)
Help me, please!
