c, \(\sqrt{117,5^2-26,5^2-1440}\)
Rút gọn rồi tính :
a) \(\sqrt{6,8^2-3,2^2}\)
b) \(\sqrt{21,8^2-18,2^2}\)
c) \(\sqrt{117,5^2-26,5^2-1440}\)
d) \(\sqrt{146,5^2-109,5^2+27.256}\)
rút gọn rồi tính
117,52−26,52−1440−−−−−−−−−−−−−−−−−−√
Tính
a) \(\sqrt{13-4\sqrt{2}}\)
b) \(2\sqrt{40\sqrt{12}}-2\sqrt{75}-3\sqrt{5\sqrt{48}}\)
c) \(\sqrt{1+\dfrac{1}{1^2}+\dfrac{2}{2^2}}+\sqrt{1+\dfrac{1}{2^2}+\dfrac{2}{3^2}}+\sqrt{1+\dfrac{1}{3^2}+\dfrac{2}{4^2}}+...+\sqrt{1+\dfrac{1}{99^2}+\dfrac{2}{100^2}}\)
\(\sqrt{2+\sqrt{3}}\cdot\sqrt{2+\sqrt{2+\sqrt{3}}}\cdot\sqrt[]{2+\sqrt{2+\sqrt{2+\sqrt{3}}}}\cdot\sqrt{2-\sqrt{2+\sqrt{2+\sqrt{3}}}}\)
Tính N = 1^2/2^2-1 * 3^2/4^2-1 *** (2n+1)^2/(2n+2)-1
CMR 1/4<\(\dfrac{2-\sqrt{2+\sqrt{2+\sqrt{2+..........+\sqrt{2}}}}}{2-\sqrt{2+\sqrt{2+...................+\sqrt{2}}}}\)<\(\dfrac{3}{10}\)
tính E =căn (2+ căn 3) nhân căn (2+2 căn 2) nhân căn ( 2+ căn ( 2 + căn ( 2+ căn 3))) nhân căn ( 2 - căn (2+ căn (2+ căn 3)))
giúp mình với !!
CMR \(\dfrac{1}{4}\)<\(\dfrac{2-\sqrt{2+\sqrt{2+\sqrt{2+..............+\sqrt{2}}}}}{2-\sqrt{2+\sqrt{2+..............+\sqrt{2}}}}\)<\(\dfrac{3}{10}\)