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\(32^{15}=\left(2^5\right)^{15}=2^{5.15}=2^{75}\)
\(4^{39}=\left(2^2\right)^{39}=2^{2.39}=2^{78}\)
Do \(2^{78}>2^{75}\)
\(\Rightarrow4^{39}>32^{15}\)
\(\Rightarrow1+4+4^2+...+4^{39}>32^{15}\)
\(\Rightarrow3\left(1+4+4^2+...+4^{39}\right)>32^{15}\)
Vậy \(A>B\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(2^6=\left(2^3\right)^2=8^2\)\(=64\)
\(6^2=36\)
Vì \(8^2>6^2\)
⇒\(2^6>6^2\)
\(a,2^6=64\)
\(6^2=36\)
Vì \(64>36\) ⇒ \(2^6>6^2\)
\(b,3^4=81\)
\(4^3=64\)
Vì \(81>64\) ⇒ \(3^4>4^3\)
\(c,5^4=625\)
\(4^5=1024\)
Vì \(625< 1024\) ⇒ \(5^4< 4^5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(22)3 và 26
(22)3 = 22.3 = 26
Vậy (22)3 = 26
\(\left(2^2\right)^3\) và \(2^6\)
- \(\left(2^2\right)^3=64\)
- \(2^6=64\)
Vì \(64=64\)
Nên \(\left(2^2\right)^3=2^6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2023A=\dfrac{2023^{31}+4046}{2023^{31}+2}=1+\dfrac{4044}{2023^{31}+2}\)
\(2023B=\dfrac{2023^{32}+4046}{2023^{32}+2}=1+\dfrac{4044}{2023^{32}+2}\)
mà 2023^31+2<2023^32+2
nên A>B
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1: a) \(M=1+5+5^2+...+5^{100}\)
\(5M=5+5^2+5^3+...+5^{101}\)
\(5M-M=\left(5+5^2+5^3+...+5^{101}\right)-\left(1+5+5^2+...+5^{100}\right)\)
\(4M=5^{101}-1\)
\(M=\frac{5^{101}-1}{4}\)
b) \(N=2+2^2+...+2^{100}\)
\(2N=2^2+2^3+...+2^{101}\)
\(2N-N=\left(2^2+2^3+...+2^{101}\right)-\left(2+2^2+...+2^{100}\right)\)
\(N=2^{101}-2\)
Bài 2:
a) \(16^{32}=\left(2^4\right)^{32}=2^{128}\)
\(32^{16}=\left(2^5\right)^{16}=2^{80}\)
Vì \(2^{128}>2^{80}\Rightarrow16^{32}>32^{16}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(6^2< 8^2=\left(2^3\right)^2=2^{2\cdot3}=2^6\)
\(32^3=\left(2^5\right)^3=2^{3\cdot5}=2^{15}\)
Mà: `6<15=>2^6<2^15=>8^2<32^3`
`=>6^2<32^3`
vậy: ...
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