So sánh 3^444 và 4^333
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
333444=(3.111)4.111=(27.1114)111=(27.111.1113)111
444333=(4.111)3.111=(64.1113)111
=>333444>444333
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Do 300 < 450
⇒ 3³⁰⁰ < 3⁴⁵⁰
b) 333⁴⁴⁴ = (333⁴)¹¹¹ = (111⁴.3⁴)¹¹¹
444³³³ = (444³)¹¹¹ = (111³.4³)¹¹¹
Do 4 > 3 nên 111⁴ > 111³ (1)
Lại có:
3⁴ = 81
4³ = 64
Do 81 > 64 nên 3⁴ > 4³ (2)
Từ (1) và (2) ⇒ 111⁴.3⁴ > 111³.4³
⇒ (111⁴.3⁴)¹¹¹ > (111³.4³)¹¹¹
Vậy 333⁴⁴⁴ > 444³³³
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:4333=(43)111=64111
3444=(34)111=81111
Vì 64<81 nên 64111<81111
hay 4333<3444
Vậy 4333<3444
TL :
Ta có : 4^333 = ( 43 ) ^111 = 64 ^ 111
3^444 = ( 34 ) ^111 = 81 ^ 111
Vì 64 < 81
=) 64^111 < 81^111
Nên 4^333 < 3^444
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
333444=(3.111)4.111=(81.1114)111=(81.111.1113)111
444333=(4.111)3.111=(64.1113)111
Vì (81.111.1113)111>(64.1113)111 nên 333444>444333
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 333^444= 111^444 x 3^444
444^333 = 111^333 x 4^333
Tách: 3^444 = (3^4)^111 =81^111 <=>4^333 = (4^3)^111 = 64^111
Mà: {111^444 > 111^333 (1)
{81^111 > 64^111 hay: (3^4)^111 > (4^3)^111 (2)
Từ (1) và (2) ta có:333^444 > 444^333
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(81=3^4>4^3=64\)
\(\Rightarrow4^3\cdot111^3< 3^4\cdot111^3< 3^4\cdot111^4\)
\(\Rightarrow444^3< 333^4\)
\(\Rightarrow\left(444^3\right)^{111}< \left(333^4\right)^{111}\)
\(\Rightarrow444^{333}< 333^{444}\)
\(\Rightarrow-333^{444}< -444^{333}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(333^{444}=\left(111.3\right)^{444}=111^{444}.3^{444}\)
\(444^{333}=\left(111.4\right)^{333}=111^{333}.4^{333}\)
mà \(3^{444}=3^{4.111}=81^{111}\)
\(4^{333}=4^{3.111}=64^{111}\)
ta có : \(111^{444}>111^{333}\)
\(81^{111}>64^{111}\)
\(\Rightarrow333^{444}>444^{333}\)
Ta có: \(333^{444}=\left(3.111\right)^{444}=3^{444}.111^{444}\)
\(444^{333}=\left(4.111\right)^{333}=4^{333}.111^{333}\)
Ta lại có: \(3^{444}=\left(3^4\right)^{111}=81^{111}\)
\(4^{333}=\left(4^3\right)^{111}=64^{111}\)
\(\Rightarrow3^{444}>4^{333}\left(81^{111}>64^{111}\right)\)
Mặt khác: \(111^{444}>111^{333}\)
\(\Rightarrow3^{444}.111^{444}>4^{333}.111^{333}\)
Vậy \(333^{444}>444^{333}\)
>
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^_^
Ta có:
3^444=3^(4.111)=81^111
4^333=4^(3.111)=64^111
Do 64^111<81^111 nên 3^444>4^333