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7245-7244=72(45-44)=721=72
7244-7243=72(44-43)=721=72
\(\Rightarrow\)7245-7244=7244-7243
\(72^{45}-72^{44}=72^{44}.72-72^{43}.72=72.\left(72^{44}-72^{43}\right)\)
Vì \(72\left(72^{44}-72^{43}\right)>72^{44}-72^{43}\)
=> \(72^{45}-72^{44}>72^{44}-72^{43}\)
+Ta co : 7245-744=721=72
7244-7243=721=72
Do 72=72
Vay 7245-7244=7244-7243
\(72^{45}-72^{44}=72^{44}\left(72-1\right)=72^{44}.71\)
\(72^{44}-72^{43}=72^{43}\left(72-1\right)=72^{43}.71\)
\(Vì\) \(72^{44}.71>72^{43}.71\)
\(\Rightarrow72^{45}-72^{44}>72^{44}-72^{43}\)
Ta có : \(72^{45}-72^{44}=72^{44}\times\left(72-1\right)=72^{44}\times71\)
\(72^{44}-72^{43}=72^{43}\times\left(72-1\right)=72^{43}\times71\)
\(\Rightarrow72^{45}-72^{44}>72^{44}-72^{43}\)
cái này mình học ròi
\(72^{45}-72^{44}=72^{44}.72-72^{44}.1=72^{44}.\left(72-1\right)=72^{44}.71\)
\(72^{44}-72^{43}=72^{43}.72-72^{43}.1=72^{43}.\left(72-1\right)=72^{43}.71\)
vì \(72^{44}.71>72^{43}.71\)nên \(72^{45}-72^{44}>72^{44}-72^{43}\)
a) Vì a - 5 ≥ b - 5 => a - 5 + 5 ≥ b - 5 + 5
=> a ≥ b
b) Vì 15 + a ≤ 15 + b => 15 + a -15 ≤ 15 + b -15
=> a ≤ b
Ta có:+) \(72^{45}-72^{44}=72^{44}.\left(72-1\right)\)
\(=72^{44}.71\)
+) \(72^{44}-72^{43}=72^{43}.\left(72-1\right)\)
\(=72^{43}.71\)
Vì \(72^{43}< 72^{44}\) \(\implies\) \(72^{43}.71< 72^{44}.71\)
\(\implies\) \(72^{44}-72^{43}< 72^{75}-72^{44}\)
\(172^{65}-172^{64}=172^{64}.\left(172-1\right)=172^{64}.171\)
\(172^{64}-172^{63}=172^{63}\left(172-1\right)=172^{63}.171\)
vi \(172^{64}>172^{63}\) nen \(172^{64}.171>172^{63}.171\)
vay \(172^{65}-172^{64}>172^{64}-172^{63}\)
a, 1030 = (103)10 = 100010
2100 = (210)10 = 102410
=> 1030 < 2100
b, 540 = (54)10 = 50010
=> 540 < 62010
c, 339 = (313)3
1121 = (117)3
vì 313 < 117 => 339 < 1121
d, 7245 - 7244 = 7244 . 72 - 7244 = 7244( 72 - 1)
7244 - 7243 = 7243 . 72 - 7243 = 7243(72 - 1)
vì 7244 > 7243 => 7245 - 7244 > 7244 - 7243
nhấn đúng cho mk nhé
\(72^{65}-72^{64}=72^{64}.\left(72-1\right)=72^{64}.71\)
\(72^{64}-72^{63}=72^{63}.\left(72-1\right)=72^{63}.71\)
Vì 71 = 71 mà\(72^{63}< 72^{64}\)nên \(71.72^{63}< 71.72^{64}\)hay \(72^{65}-72^{64}>72^{64}-72^{63}\)
72^65-72^64=72^64.72-72^63.72=72.(72^64-72^63)
Vi` 72.(72^64-72^63)>72^64-72^63
=>72^65-72^64>72^64-72^63
Chuc ban hoc tot