Tính:
a, √49 . √144+ √256 : √64
= 7 . 12 + 16 : 8
= 84 + 2
= 86
b, 72 : √2^2.36.3^2- √225
= 72: 2.6.3-15
= -13
Tính:
a, √49 . √144+ √256 : √64
= 7 . 12 + 16 : 8
= 84 + 2
= 86
b, 72 : √2^2.36.3^2- √225
= 72: 2.6.3-15
= -13
Tính giá trị
a) A= \(\sqrt{49}\)- 2\(\sqrt{36}\) + 3\(\sqrt{4}\)
b) B= \(\frac{1}{2}\)\(\sqrt{\frac{144}{225}}\)- 7\(\sqrt{100}\)+4\(\sqrt{\frac{361}{400}}\)
B1, Tính a, \(\sqrt{\left(2-\sqrt{5}\right)^2}-\sqrt{5}\)
b, \(\sqrt{16}.\sqrt{25}+\sqrt{256}.\sqrt{64}\)
c,\(\sqrt{\left(\sqrt{2}-3\right)^2}-\sqrt{\left(5-\sqrt{2}\right)^2}\)
1) Tính:
a) \(\sqrt{4.36}\)
b) (\(\sqrt{8}\) - 3\(\sqrt{2}\)) . \(\sqrt{2}\)
c)\(\dfrac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}\)
d) \(\dfrac{2}{\sqrt{5}+2}\) + \(\dfrac{2}{\sqrt{5}-2}\)
rút gọn và tính biểu thức sau
a, \(3\sqrt{144}-5\sqrt{49}+\dfrac{1}{2}\sqrt{36}\)
Tính:
a,\(\sqrt{\dfrac{2}{2-\sqrt{3}}}-\sqrt{\dfrac{2}{2+\sqrt{3}}}\)
b,\(\sqrt{\dfrac{2}{3}}-\sqrt{24}+2\sqrt{\dfrac{3}{8}}+\dfrac{1}{6}\)
Thực hiện phép tính:
a, M = \(\sqrt{9+4\sqrt{5}}\) - \(\sqrt{9-4\sqrt{5}}\)
b, N = \(\sqrt{8-2\sqrt{7}}\) - \(\sqrt{8+2\sqrt{7}}\)
\(\sqrt{y-2}-3\sqrt{64\left(y-2\right)}+4\sqrt{49\left(y-2\right)}\)
\(\sqrt{36.}\sqrt{49}-\sqrt{225}:\sqrt{25}\)
\(\sqrt{13+30\sqrt{2+\sqrt{9+4\sqrt{2}}}}\)\(\sqrt{4-2\sqrt{3}}+\sqrt{4+2\sqrt{3}}\)\(\sqrt{20}-\sqrt{45}+3\sqrt{18}+\sqrt{72}\) Rút gọn biểu thức:a)\(\sqrt{4.36}+\sqrt{\frac{25}{81}\frac{16}{49}}\)