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\(27^{13}=\left(3^3\right)^{13}=3^{39};243^8=\left(3^5\right)^8=3^{40};3^{39}< 3^{40}\Rightarrow27^{13}< 243^8\\ 125^{80}=\left(5^3\right)^{80}=5^{240};25^{118}=\left(5^2\right)^{118}=5^{236};5^{240}>5^{236}\Rightarrow125^{80}>25^{118}\)
a. \(5^{127}=5.5^{126}=5.125^{72}>119^{72}\)
\(\Rightarrow5^{217}>119^{72}\)
b. \(2^{1000}=\left(2^5\right)^{200}=32^{200}\)
\(5^{400}=\left(5^2\right)^{200}=25^{200}\)
\(\Rightarrow2^{1000}>5^{400}\)
c. \(9^{12}=\left(3^2\right)^{12}=3^{24}\)
\(27^7=\left(3^3\right)^7=3^{21}\)
\(\Rightarrow9^{12}>27^7\)
d. \(125^{80}=\left(5^3\right)^{80}=5^{240}\)
\(25^{118}=\left(5^2\right)^{118}=5^{236}\)
\(\Rightarrow125^{80}>25^{118}\)
e. \(5^{40}=\left(5^4\right)^{10}=625^{10}\)
\(\Rightarrow5^{40}>620^{10}\)
f. \(27^{11}=\left(3^3\right)^{11}=3^{33}\)
\(81^8=\left(3^4\right)^8=3^{32}\)
\(\Rightarrow27^{11}>81^8\)
a) 1024 9 = ( 2 10 ) 9 = 2 90 < 2 100
b) 6 . 5 29 > 5 . 5 29 = 5 30
c) 10 30 = ( 10 3 ) 10 = 1000 10 ; 2 100 = ( 2 10 ) 10 = 1024 10 n ê n 10 30 < 2 100 .
a) Cách 1: 2 100 = 2 10 10 = 1024 10 > 1024 9
Cách 2: 1024 9 = 2 10 9 = 2 90 < 2 100
b) 6 . 5 29 > 5 . 5 29 = 5 30
c) 2 98 = 2 2 49 = 4 49 < 9 49
d) 10 30 = 10 3 10 = 1000 10 ; 2 100 = 2 10 10 = 1024 10 nên 10 30 < 2 100
\(A=8^{200}=\left(2^3\right)^{200}=2^{600}=2^{100}\cdot2^{500}\\ B=2^{100}\cdot9^{150}=2^{100}\cdot\left(3^2\right)^{150}=2^{100}\cdot3^{300}\\ 2^{500}=32^{100};3^{300}=27^{100}\\ 32^{100}>27^{100}\Rightarrow2^{500}>3^{300}\\ \Rightarrow A>B\)
`@` `\text {Ans}`
`\downarrow`
`2^100` và `3^50`
Ta có:
\(2^{100}=\left(2^4\right)^{25}=16^{25}\)
\(3^{50}=\left(3^2\right)^{25}=9^{25}\)
Vì `16 > 9 =>`\(16^{25}>9^{25}\Rightarrow2^{100}>3^{50}\)
Vậy, `2^100 > 3^50` `.`
Sao không so sánh \(4^{50}\) với \(3^{50}\) cho nhanh nhỉ
Ta có: 2100=231.269
= 231 . 263 . 26
= 231 . ( 29 )7 . ( 22)3
= 231 . 5127 . 43
Lại có : 1031 = 231 . 531
= 231 . 528 . 53
= 231 . ( 54) 7 . 53
= 231 . 6257 . 53
=>231 . 6257 . 53 > 231 . 3127 . 53 > 231 . 3127 . 43
<=> 2100<1031
Ta có:
\(2^{200}.2^{100}=\left(2^2\right)^{100}.2^{100}=4^{100}.2^{100}=\left(4.2\right)^{100}=8^{100}\)
\(3^{100}.3^{100}=\left(3.3\right)^{100}=9^{100}\)
Vì \(8< 9\) nên \(8^{100}< 9^{100}\)
Vậy \(2^{200}.2^{100}< 3^{100}.3^{100}\)
\(#WendyDang\)
a)
Ta có :
\(1024^9=\left(2^{10}\right)^9=2^{90}< 2^{100}\)
\(\Rightarrow1024^9< 2^{100}\)
b)
\(\begin{cases}9^{12}=\left(3^2\right)^{12}=3^{24}\\27^7=\left(3^3\right)^7=3^{21}\end{cases}\)
Vì \(3^{24}>3^{21}\)
=> \(9^{12}>27^7\)
c)
\(\begin{cases}125^{80}=\left(5^3\right)^{80}=5^{240}\\25^{118}=\left(5^2\right)^{118}=5^{236}\end{cases}\)
=> 12550>25118