So sánh: \(\sqrt{29}\)+\(\sqrt{3}\)+\(\sqrt{2003}\) và 50
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{29}>\sqrt{25}\)= 5
\(\sqrt{3}>1\)
\(\sqrt{2003}>\sqrt{1936}=44\)
Cộng từng vế của ba bất đẳng thức ta được
\(\sqrt{29}+\sqrt{3}+\sqrt{2003}\) > 1+5 +44 = 50
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{29}+\sqrt{3}+\sqrt{2003}>\sqrt{25}+\sqrt{1}+\sqrt{1936}=5+1+44=50\)
\(\text{Vậy }\sqrt{29}+\sqrt{3}+\sqrt{2003}>50\)
\(\sqrt{29}+\sqrt{3}+\sqrt{2013}>\sqrt{25}+\sqrt{1}+\sqrt{1936}=5+1+44=50\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{2004}-\sqrt{2003}=\dfrac{1}{\sqrt{2004}+\sqrt{2003}}\)
\(\sqrt{2006}-\sqrt{2005}=\dfrac{1}{\sqrt{2006}+\sqrt{2005}}\)
Mà \(\sqrt{2004}+\sqrt{2003}< \sqrt{2006}< \sqrt{2005}\)
\(\Rightarrow\dfrac{1}{\sqrt{2004}+\sqrt{2003}}>\dfrac{1}{\sqrt{2006}+\sqrt{2005}}\)
\(\Rightarrow\sqrt{2004}-\sqrt{2003}>\sqrt{2006}-\sqrt{2005}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{29}+\sqrt{3}+\sqrt{2015}>\sqrt{25}+\sqrt{1}+\sqrt{1936}\)\(=5+1+44=50\)
\(\text{Vậy }\sqrt{29}+\sqrt{3}+\sqrt{2015}>50\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\sqrt[]{50}+\sqrt[]{65}\Rightarrow A^2=50+65+2\sqrt[]{50.65}=115+2\sqrt[]{5.10.5.13=}115+10\sqrt[]{130}\left(1\right)\)
\(B=\sqrt[]{15}+\sqrt[]{115}\Rightarrow B^2=15+115+2\sqrt[]{15.115}=15+115+2\sqrt[]{3.5.5.23}=15+115+10\sqrt[]{69}\left(2\right)\)Ta có \(10\sqrt[]{130}< 10\sqrt[]{69.2}=10\sqrt[]{2}\sqrt[]{69}< 15+10\sqrt[]{69}\left(3\right)\)
\(\left(1\right),\left(2\right),\left(3\right)\Rightarrow A^2< B^2\Rightarrow A< B\)
\(\Rightarrow\sqrt[]{50}+\sqrt[]{65}< \sqrt[]{15}+\sqrt[]{115}\)
So sánh gì thế em, em nhập đủ đề vào hi
![](https://rs.olm.vn/images/avt/0.png?1311)
Áp dụng BĐT CAuchy-Schwarz ta có:
Đặt \(A^2=\left(\sqrt{2003}+\sqrt{2005}\right)^2\)
\(\le\left(1+1\right)\left(2003+2005\right)\)
\(=2\cdot4008=8016\)
\(\Rightarrow A^2\le8016\Rightarrow A\le2\sqrt{2004}=B\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có :\(\left(\sqrt{2}+\sqrt{3}\right)^2=2+3+2\sqrt{2}\cdot\sqrt{3}=5+2\sqrt{6}>5=\left(\sqrt{5}\right)^2\)
\(\Rightarrow\left(\sqrt{2}+\sqrt{3}\right)^2>\left(\sqrt{5}\right)^2\Leftrightarrow\sqrt{2}+\sqrt{3}>\sqrt{5}\)
a) \(\sqrt{2}+\sqrt{3}>\sqrt{5}\)
b) \(\sqrt{2003}+\sqrt{2005}< 2.\sqrt{2004}\)
HOK TOT
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{2003}\)\(+\)\(\sqrt{2004}\)\(>\)\(2\)\(\sqrt{2004}\)
k mik nha
Đặt \(A^2=\left(\sqrt{2003}+\sqrt{2004}\right)^2>0\)
\(\le\left(1+1\right)\left(2003+2004\right)=2\cdot4007=8014\)
\(\Rightarrow A^2\le8014\). Và
\(B^2=\left(2\sqrt{2004}\right)^2=4\cdot2004=8016\)
Suy ra \(A^2\le8014< 8016=B^2\Leftrightarrow A< B\)
-Ta có: √29 > √25 =5
√3 > 1
√2003 >√1936 =44
-Cộng từng vế của ba bất đẳng thức ta được
√29 + √3 + √2003 > 1+5 +44 = 50
-Vậy √29 + √3 + √2003 = 50
\(\sqrt{29}+\sqrt{3}+\sqrt{2003}>\sqrt{25}+\sqrt{1}+\sqrt{1936}=5+1+44=50\)