`= sqrt 9 - sqrt 16 + 13`.
`= 3-4+13`
`=12`.
`= sqrt 9 - sqrt 16 + 13`.
`= 3-4+13`
`=12`.
\(A=\sqrt{\frac{36-16\sqrt{5}}{12+2\sqrt{35}}}-\sqrt{\frac{81-36\sqrt{5}}{11+4\sqrt{7}}}\)
Giải phương trình: \(5\sqrt{\frac{9x-27}{25}}-7\sqrt{\frac{4x-12}{9}}-7\sqrt{x^2-9}+18\sqrt{\frac{9x^2-81}{91}}=0\)
Giai pt sau
\(25\sqrt{\dfrac{a-3}{25}}-7\sqrt{\dfrac{4a-12}{9}}-7\sqrt{a^2-9}+18\sqrt{\dfrac{9a^2-81}{81}}=0\)
Help me plsssss
cho x=\(\left(\dfrac{\sqrt[3]{8-3\sqrt{5}}+\sqrt[3]{64-12\sqrt{20}}}{\sqrt[3]{57}}\right)\sqrt[3]{8+3\sqrt{5}}\);y=\(\left(\dfrac{\sqrt[3]{9}-\sqrt{2}}{\sqrt[3]{3}+\sqrt[4]{2}}+\dfrac{\sqrt{2}-9\sqrt[3]{9}}{\sqrt[4]{2}-\sqrt[3]{81}}\right)\)
a rút gọn x và y
b tính T = xy
\(25\sqrt{\dfrac{x-3}{25}}-7\sqrt{\dfrac{4x-12}{9}}-7\sqrt{x^2-9}+18\sqrt{\dfrac{9x^2-81}{81}}=0\)
Giải phương trình.
giúp e với ạaa :< gấp aa :((
a) \(\sqrt{4x^2-9}=2\sqrt{x+3}\)
b) \(\sqrt{4x+20}+3\sqrt{\dfrac{x-5}{9}}-\dfrac{1}{3}\sqrt{9x-45}=4\)
c) \(\dfrac{2}{3}\sqrt{9x-9}-\dfrac{1}{4}\sqrt{16x-16}+27\sqrt{\dfrac{x-1}{81}}=4\)
d)\(5\sqrt{\dfrac{9x-27}{25}}-7\sqrt{\dfrac{4x-12}{9}}-7\sqrt{x^2-9}+18\sqrt{\dfrac{9x^2-81}{81}}=0\)
a, căn bậc 117,5 mũ 2 - 26,5 mũ 2 - 1440
b căn bậc 146,5 mũ 2 - 109, 5 mũ 2 + 27 nhân 256
cho \(x=\frac{\sqrt[3]{5-3\sqrt{5}}+\sqrt[3]{64-12\sqrt{20}}}{\sqrt[3]{57}}.\)\(\sqrt[3]{8+3\sqrt{5}}\)
\(y=\frac{\sqrt[3]{9}-\sqrt{2}}{\sqrt[3]{3}+\sqrt[4]{2}}+\frac{2-9\sqrt[3]{9}}{\sqrt[4]{2}-\sqrt{81}}\)
Tính xy
Tìm x để các căn bậc hai sau có nghĩa
a) \(\sqrt{\dfrac{15+3x^2}{-6}}\) b) \(\sqrt{\dfrac{-81}{-12-x^2}}\)
c) \(\sqrt{\dfrac{31\left(x^2+21\right)}{3}}\) d) \(\sqrt{\dfrac{-12}{11+x^2}}\)
e) \(\sqrt{\dfrac{21}{-x^2-17}}\)