\(=\left(\sqrt{5}-1-5\right)\cdot\left(\frac{\sqrt{5}\left(1+\sqrt{5}\right)}{1+\sqrt{5}}+6\right)=\left(\sqrt{5}-6\right)\left(\sqrt{5}+6\right)=5-36=-31\)
Các câu hỏi tương tự
Tínha/left(frac{2sqrt{3}-sqrt{6}}{sqrt{8}-2}-frac{sqrt{216}}{3}right).frac{1}{sqrt{6}}b/left(frac{5}{4-sqrt{11}}+frac{1}{3+sqrt{7}}-frac{6}{sqrt{7}-2}-frac{sqrt{7}-5}{2}right)c/left(frac{sqrt{14}-sqrt{7}}{1-sqrt{2}}+frac{sqrt{15}-sqrt{5}}{1-sqrt{3}}right):frac{1}{sqrt{7}-sqrt{5}}d/frac{sqrt{5}-sqrt{3}}{sqrt{5}+sqrt{3}}+frac{sqrt{5}+sqrt{3}}{sqrt{5}-sqrt{3}}-frac{sqrt{5}+1}{sqrt{5}-1}
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Tính
a/\(\left(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}\right).\frac{1}{\sqrt{6}}\)
b/\(\left(\frac{5}{4-\sqrt{11}}+\frac{1}{3+\sqrt{7}}-\frac{6}{\sqrt{7}-2}-\frac{\sqrt{7}-5}{2}\right)\)
c/\(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
d/\(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}+\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}-\frac{\sqrt{5}+1}{\sqrt{5}-1}\)
giúp mik vstrục căn thức ở mẫufrac{1sqrt{2}}{sqrt{2}.sqrt{2}} frac{1sqrt[]{3}}{sqrt{3}.sqrt{3}}frac{2sqrt{5}-5}{sqrt{5}-2}frac{6-2sqrt{6}}{2-sqrt{6}}frac{5sqrt{6}-6sqrt{5}}{sqrt{5}-sqrt{6}}frac{1}{sqrt{5}-1}frac{1}{4-2sqrt{a}+a}frac{1}{b-2sqrt{b}+4}frac{1}{b-3sqrt{b}+9}
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giúp mik vs
trục căn thức ở mẫu
\(\frac{1\sqrt{2}}{\sqrt{2}.\sqrt{2}}\) \(\frac{1\sqrt[]{3}}{\sqrt{3}.\sqrt{3}}\)\(\frac{2\sqrt{5}-5}{\sqrt{5}-2}\)\(\frac{6-2\sqrt{6}}{2-\sqrt{6}}\)\(\frac{5\sqrt{6}-6\sqrt{5}}{\sqrt{5}-\sqrt{6}}\)\(\frac{1}{\sqrt{5}-1}\)\(\frac{1}{4-2\sqrt{a}+a}\)\(\frac{1}{b-2\sqrt{b}+4}\)\(\frac{1}{b-3\sqrt{b}+9}\)
a) \(\frac{1}{2+\sqrt{3}}+\frac{\sqrt{2}}{\sqrt{6}}-\frac{2}{3+\sqrt{3}}\)
b) \(\frac{\sqrt{5}-2}{5+2\sqrt{5}}-\frac{1}{2+\sqrt{5}}+\frac{1}{\sqrt{5}}\)
c)\(\sqrt{15-6\sqrt{6}}+\sqrt{33-12\sqrt{6}}\)
d)\(\sqrt{2-\sqrt{3}}+\sqrt{2+\sqrt{3}}\)
e)\(\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}-\sqrt{\frac{3+\sqrt{5}}{3-\sqrt{5}}}\)
f)\(\left(\frac{1}{3-\sqrt{5}}-\frac{1}{3+\sqrt{5}}\right):\frac{5-\sqrt{5}}{\sqrt{5}-1}\)
thực hiện phép tính: a)left(frac{sqrt{14}-sqrt{7}}{1-sqrt{2}}+frac{sqrt{15}+sqrt{5}}{1-sqrt{3}}right):frac{1}{sqrt{7}-sqrt{5}}b)frac{sqrt{5}-sqrt{3}}{sqrt{5}+sqrt{3}}+frac{sqrt{5}+sqrt{3}}{sqrt{5}-sqrt{3}}+frac{sqrt{5}+1}{sqrt{5}-1}c)2sqrt{18sqrt{3}}-2sqrt{5sqrt{3}}-3sqrt{5sqrt{48}}d)left(2sqrt{5}+sqrt{12}right)left(sqrt{3}-sqrt{5}right)e)sqrt{2}+sqrt{frac{1}{2}}+sqrt{72}-sqrt{frac{3}{2}}f)sqrt{2}sqrt{2+sqrt{3}}-2left(sqrt{3}-1right)g)sqrt{5-2sqrt{6}}+sqrt{5+2sqrt{6}}-left(2sqrt{3}-2007right)
Đọc tiếp
thực hiện phép tính: a)\(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}+\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
b)\(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}+\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}+\frac{\sqrt{5}+1}{\sqrt{5}-1}\)
c)\(2\sqrt{18\sqrt{3}}-2\sqrt{5\sqrt{3}}-3\sqrt{5\sqrt{48}}\)
d)\(\left(2\sqrt{5}+\sqrt{12}\right)\left(\sqrt{3}-\sqrt{5}\right)\)
e)\(\sqrt{2}+\sqrt{\frac{1}{2}}+\sqrt{72}-\sqrt{\frac{3}{2}}\)
f)\(\sqrt{2}\sqrt{2+\sqrt{3}}-2\left(\sqrt{3}-1\right)\)
g)\(\sqrt{5-2\sqrt{6}}+\sqrt{5+2\sqrt{6}}-\left(2\sqrt{3}-2007\right)\)
Thực hiện phép tính :1 ) frac{1}{5+2sqrt{6}}+frac{1}{5-2sqrt{6}}2 ) frac{5+sqrt{5}}{5-sqrt{5}}+frac{5-sqrt{5}}{5+sqrt{5}}3 ) frac{1}{2sqrt{5}+3sqrt{2}}-frac{1}{2sqrt{5}-3sqrt{2}}4 ) frac{1}{3sqrt{2}-4}-frac{1}{3sqrt{2}+4}5 ) frac{1}{sqrt{7-sqrt{24}}+1}-frac{1}{sqrt{7-sqrt{24}}-1}6 ) frac{sqrt{3}}{sqrt{sqrt{3}+1}-1}-frac{1}{sqrt{sqrt{3}+1}+1}7 ) sqrt{frac{3+sqrt{5}}{3-sqrt{5}}}+sqrt{frac{3-sqrt{5}}{3+sqrt{5}}}8 ) sqrt{frac{5+2sqrt{6}}{5-2sqrt{6}}}+sqrt{frac{5-2sqrt{6}}{5+2sqrt{6}}}
Đọc tiếp
Thực hiện phép tính :
1 ) \(\frac{1}{5+2\sqrt{6}}\)\(+\)\(\frac{1}{5-2\sqrt{6}}\)
2 ) \(\frac{5+\sqrt{5}}{5-\sqrt{5}}\)\(+\)\(\frac{5-\sqrt{5}}{5+\sqrt{5}}\)
3 ) \(\frac{1}{2\sqrt{5}+3\sqrt{2}}\)\(-\)\(\frac{1}{2\sqrt{5}-3\sqrt{2}}\)
4 ) \(\frac{1}{3\sqrt{2}-4}\)\(-\)\(\frac{1}{3\sqrt{2}+4}\)
5 ) \(\frac{1}{\sqrt{7-\sqrt{24}}+1}\)\(-\)\(\frac{1}{\sqrt{7-\sqrt{24}}-1}\)
6 ) \(\frac{\sqrt{3}}{\sqrt{\sqrt{3}+1}-1}\)\(-\)\(\frac{1}{\sqrt{\sqrt{3}+1}+1}\)
7 ) \(\sqrt{\frac{3+\sqrt{5}}{3-\sqrt{5}}}\)\(+\)\(\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}\)
8 ) \(\sqrt{\frac{5+2\sqrt{6}}{5-2\sqrt{6}}}\)\(+\)\(\sqrt{\frac{5-2\sqrt{6}}{5+2\sqrt{6}}}\)
rút gọn biểu thứca) 5sqrt{frac{1}{5}}+frac{1}{3}sqrt{45}+frac{5-sqrt{5}}{sqrt{5}}b) sqrt{48}-6sqrt{frac{1}{3}}+frac{sqrt{3}-3}{sqrt{3}}c) left(frac{sqrt{6}-sqrt{2}}{1-sqrt{3}}-frac{5}{sqrt{5}}right):left(frac{1}{sqrt{5}-sqrt{2}}right) giải phương trinha) sqrt{4x+4}-sqrt{9x-9}-8sqrt{frac{x
+1}{16}}5các bạn help mik với
Đọc tiếp
rút gọn biểu thức
a) \(5\sqrt{\frac{1}{5}}+\frac{1}{3}\sqrt{45}+\frac{5-\sqrt{5}}{\sqrt{5}}\)
b) \(\sqrt{48}-6\sqrt{\frac{1}{3}}+\frac{\sqrt{3}-3}{\sqrt{3}}\)
c) \(\left(\frac{\sqrt{6}-\sqrt{2}}{1-\sqrt{3}}-\frac{5}{\sqrt{5}}\right):\left(\frac{1}{\sqrt{5}-\sqrt{2}}\right)\)
giải phương trinh
a) \(\sqrt{4x+4}-\sqrt{9x-9}-8\sqrt{\frac{x +1}{16}}=5\)
các bạn help mik với
Thực hiện các phép tính sau:
a) \(\frac{\sqrt{7}-5}{2}-\frac{6-2\sqrt{7}}{4}+\frac{6}{\sqrt{7}-2}-\frac{5}{4+\sqrt{7}}\)
b) \(\frac{1}{\sqrt{3}+\sqrt{2}-\sqrt{5}}-\frac{1}{\sqrt{3}+\sqrt{2}+\sqrt{5}}\)
c) \(\frac{1}{\sqrt{3}}+\frac{1}{3\sqrt{2}}+\frac{1}{\sqrt{3}}\sqrt{\frac{5}{12}-\frac{1}{\sqrt{6}}}\)
Giúp em với mọi người ơi! Em đang rất cần!
Chứng minh rằng:
a)\(\left(\sqrt[3]{3+2\sqrt{2}}+\sqrt[3]{3-2\sqrt{2}}\right)^8>3^6\)
b) \(\sqrt[3]{\sqrt[5]{\frac{32}{5}}-\sqrt[5]{\frac{27}{5}}}=\sqrt[5]{\frac{1}{25}}+\sqrt[5]{\frac{3}{25}}-\sqrt[5]{\frac{9}{25}}\)