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Ta xét :
\(444^{555}=\left(444^5\right)^{111}=\left(111^5.4^5\right)^{111}=\left(111^5.1024\right)^{111}\)
\(555^{444}=\left(555^4\right)^{111}=\left(111^4.5^4\right)^{111}=\left(111^4.625\right)^{111}\)
Mà \(111^5.1024>111^4.625\)
\(\Rightarrow444^{555}>555^{444}\)
ta có: \(444^{555}=444^{\left(111\times5\right)}=\left(444^5\right)^{111}\)
\(555^{444}=555^{\left(111\times4\right)}=\left(555^4\right)^{111}\)
ta có: \(444^5=\left(4\times111\right)^5=4^5\times111^5\)= \(1024\times111\times111^4\)
\(555^4=\left(5\times111\right)^4=5^4\times111^4\) = \(625\times111^4\)
ta có: \(1024\times111\times111^4\) > \(625\times111^4\)
\(\Rightarrow\)\(444^5>555^4\)
mình làm hơi tắt bạn tự hoàn thiện nha.
444^5= (111^4)^5=11^20
555^4= (111^5)^4=111^20
=) 444^5=555^4
\(444^5=\left(444^{\frac{5}{4}}\right)^4\approx2038^4\)
vì:\(2038^4>555^4\Rightarrow444^5>555^4\)
444^555 = (444^5)^111 = (111^5.4^5)^111.
555^444 = (555^4)^111 = (111^4.5^4)^111.
Do 111^5 > 111^4 va 4^5 > 5^4 nen 111^5.4^5 > 111^4.5^4
a. 3450 = (33)150 = 27150;
5300 = (52)150 = 25150
Vì 27150 > 25150
=> 3450 > 5300.
b. 333444 = (3.111)444 = 3444.111444 =(34)111.111444=81111.111444
444333=(4.111)333=4333.111333=(43)111.111333=64111.111333
Vì 81111 > 64111 và 111444 > 111333
=> 81111.111444 > 64111.111333
=> 333444 > 444333.
c. 2014.2016
= 2014.(2015+1)
= 2014.2015+2014 (1)
20152
=2015.2015
=2015.(2014+1)
=2015.2014+2015 (2)
Từ (1) và (2) => 2014.2016 < 20152.
b) 333\(^{444}\)và 444\(^{333}\)
Ta có :333\(^{444}\)(3.111)\(^{4.111}\)=(3\(^4\).111\(^4\))\(^{111}\)=(81.111\(^4\)).111
444\(^{333}\)(4.111)\(^{3.111}\)=4\(^3\).111\(^2\))\(^{111}\)=(64.111\(^3\))\(^{111}\)
vì 81>64 ; 111\(^4\)>111\(^3\) nêb (81.111\(^4\))\(^{111}\)>(64.113\(^3\))\(^{111}\)
hay 333\(^{444}\)>444\(^{333}\)
a, 2711 = (33)11 = 333
818 = (34)8 = 332
Vì 332 < 333 => 818 < 2711
b, 12580 = (53)80 = 5240 < 251118
c, 536 = (53)12 = 12512 > 12112 = (112)12 = 1124
Đúng 100000000000000000000000000000000000000000000
Ta co :
3200 va 2300
3200=(32)100=9100
2300=(23)100=8100
Ma : 9100>8100
Vay suy ra 3200>2300
tu lm tiep nhe