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4n: 2n+1
= (22)n: 2n+1
= 22n:2n+1
= 22n-n-1
= 2n-1
a) \(2.2.2.2.3.3.3.3=2^4.3^4\)
b) \(2.33.5555=2^1.3^2.5^4\)
c) \(5.5.5.5.4.4.4=5^4.4^3\)
d) \(8.8.10.25.16=2^3.2^3.2.5.5^2.2^4=2^{11}.5^3\)
\(12^2.3.12^3.4=\left(4.3\right)^2.3.4=4^2.3^2.3.4=3^3.4^3=27.64=1728\)
\(12^2.3.12^3.4=12^5.3.4=\left(3.4\right)^5.3.4=3^5.4^5.3.4=3^6.4^6=729.4096=\text{2985984}\)
A=1+2+22+...+230
2A=2+22+23+...+231
2A-A=(2+22+23+...+231)-(1+2+22+...+230)
A=231-1
=>A+1=231-1+1=231
a=1+2+2^2+.......+2^30
2a=2(1+2+2^2+...+2^30)
2a=2+2^2+2^3+...2^31
2a-a=(2+2^2+2^3+...+2^31)-(1+2+2^2+2^30)
triệt tiêu ta có
a=2^31-1
a+1=2^31-1+1
a+1=2^31
`@` `\text {Ans}`
`\downarrow`
`a)`
\(2^{13}\cdot4^5\cdot8^2\)
`=`\(2^{13}\cdot\left(2^2\right)^5\cdot\left(2^3\right)^2\)
`=`\(2^{13}\cdot2^{10}\cdot2^6\)
`=`\(2^{29}\)
`b)`
\(100^6. 1000^4. 1000000\)\(33\)
`=`\(10^{12}\cdot10^{12}\cdot10^{198}=10^{222}\)
`c)`
\(24^5. 6^5. 8^8\)
`=`\(2^{15}\cdot3^5\cdot2^5\cdot3^5\cdot2^{24}\)
`=`\(2^{15+5+24}\cdot3^{5+5}\)
`=`\(2^{44}\cdot3^{10}\)
a, \(2^{13}\cdot4^5\cdot8^2=2^{13}\cdot2^{10}\cdot2^6=2^{19}.\)
b, \(100^6\cdot1000^4\cdot1000000^{33}=10^{12}\cdot10^{12}\cdot10^{198}=10^{222}.\)
c, \(24^5\cdot6^5\cdot8^8=2^{15}\cdot3^5\cdot2^5\cdot3^5\cdot2^{24}=2^{44}\cdot3^{10}.\)
5* \(7^2\)
245 viết dưới dạng lúy thừa là:
5.72