\(\sqrt{28-6\sqrt{3}}=\sqrt{1-2\cdot\sqrt{3\cdot3^2}\cdot1+27}=\sqrt{1^2-2\cdot1\cdot\sqrt{27}+\left(\sqrt{27}\right)^2}=\sqrt{\left(1-\sqrt{27}\right)^2}=\left|1-\sqrt{27}\right|=\sqrt{27}-1\)
\(\sqrt{28-6\sqrt{3}}=\sqrt{1-2\cdot\sqrt{3\cdot3^2}\cdot1+27}=\sqrt{1^2-2\cdot1\cdot\sqrt{27}+\left(\sqrt{27}\right)^2}=\sqrt{\left(1-\sqrt{27}\right)^2}=\left|1-\sqrt{27}\right|=\sqrt{27}-1\)
I : Rút gọn
\(M=\left(4+\sqrt{5}\right)\left(\sqrt{5}-\sqrt{3}\right)\sqrt{8-2\sqrt{5}}\)
help me !!!
I : Rút gọn
\(A=\frac{1}{2\sqrt{1}+1\sqrt{2}}+\frac{1}{3\sqrt{2}+2\sqrt{3}}+...+\frac{1}{2019\sqrt{2020}+2020\sqrt{2019}}\)
help me !!!
I : Rút gọn
D=\(\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}-\sqrt{\frac{3+\sqrt{5}}{3-\sqrt{5}}}\)
\(E=\frac{1}{\sqrt{2}-\sqrt{3}}\sqrt{\frac{3\sqrt{2}-2\sqrt{3}}{3\sqrt{2}+2\sqrt{3}}}\)
help me !!!
I : Rút gọn
\(A=\sqrt{7-4\sqrt{3}}\)
\(B=\sqrt{19-8\sqrt{3}}\)
\(C=\sqrt{21-4\sqrt{5}}\)
\(D=\left(4+\sqrt{15}\right)\left(\sqrt{5}-\sqrt{3}\right)\sqrt{8-2\sqrt{5}}\)
help me !!!
P= \(\dfrac{1}{\sqrt{x}+2}-\dfrac{5}{x-\sqrt{x}-6}-\dfrac{\sqrt{x}-2}{3-\sqrt{x}}\)
a) Rút gọn P
b) Tìm giá trị lớn nhất của P
Rút gọn biểu thức: \(\frac{\sqrt{3-2\sqrt{2}}}{\sqrt{17-12\sqrt{2}}}-\frac{\sqrt{3+2\sqrt{2}}}{\sqrt{17+12\sqrt{2}}}\)
CÁC BN GIÚP MK VS,,,
\(\frac{\sqrt{4+2\sqrt{3}}-\sqrt{3}}{\left(\sqrt{5}+2\right)\cdot\sqrt[3]{17\sqrt{5}-38-2}}\)
Rút gọn
Giải giúp mình với ạ.....thanks
Rút gọn biểu thức:
A=\(\dfrac{4+\sqrt 2 -\sqrt 3 -\sqrt 6 +\sqrt 8}{2+\sqrt 2 -\sqrt 3}\)
B= 21(\(\sqrt{2+\sqrt3} +\sqrt{3-\sqrt5}\))\(^2\) - 6(\(\sqrt{2-\sqrt3}+ \sqrt{3+\sqrt5}\))\(^2\) - 15\(\sqrt{15}\)
Giúp em với ạ
Rút gọn biểu thức : A=\(\frac{3}{\sqrt{7}+2}\)+\(\frac{4}{3-\sqrt{7}}\)-\(\frac{21}{\sqrt{7}}\)