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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(C=111111\cdot18\)
\(C=3\cdot7\cdot11\cdot13\cdot37\cdot3^2\cdot2\)
\(C=\left(3\cdot3^2\right)\cdot\left(7\cdot11\cdot13\cdot37\cdot2\right)\)
\(C=3^3\cdot74074\)
\(C=27\cdot74074\)
Vậy C chia hết cho 27
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(11^{2024}\)
\(=11^2\cdot11^{2022}\)
\(=121\cdot11^{2022}\)
Vậy \(11^{2024}\) chia hết cho \(121\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(3^{2022}\)
\(=3^2\cdot3^{2020}\)
\(=3^2\cdot3^2\cdot3^{2018}\)
\(=3^4\cdot3^{2018}\)
\(=81\cdot3^{2018}\)
Vậy \(3^{2022}\) chia hết cho 81
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(A=15\cdot16\)
\(A=3\cdot5\cdot2^4\)
\(A=3\cdot5\cdot2^3\cdot2\)
\(A=2^3\cdot5\cdot3\cdot2\)
\(A=40\cdot6\)
Vậy A chia hết cho 40
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 2 + 2² + 2³ + ... + 2²⁰
= (2 + 2² + 2³ + 2⁴) + (2⁵ + 2⁶ + 2⁷ + 2⁸) + ... + (2¹⁷ + 2¹⁸ + 2¹⁹ + 2²⁰)
= 30 + 2⁴.(2 + 2² + 2³ + 2⁴) + ... + 2¹⁶.(2 + 2² + 2³ + 2⁴)
= 30 + 2⁴.30 + ... + 2¹⁶.30
= 30.(1 + 2⁴ + ... + 2¹⁶)
= 5.6.(1 + 2⁴ + ... 2¹⁶) ⋮ 5
Vậy A ⋮ 5
![](https://rs.olm.vn/images/avt/0.png?1311)
=1995*(1996+1)-1/1996*1995+1994
=1995*1996+1995-1/1996*1995+1994
=1995*1996+1994/1996*1995+1994
=1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=3+3^2+3^3+...+3^{300}\)
\(B=\left(3+3^2+3^3\right)+\left(3^4+3^5+3^6\right)+...+\left(3^{298}+3^{299}+3^{300}\right)\)
\(B=\left(3+3^2+3^3\right)+3^3\cdot\left(3+3^2+3^3\right)+...+3^{297}\cdot\left(3+3^2+3^3\right)\)
\(B=39+3^3\cdot39+...+3^{297}\cdot39\)
\(B=39\cdot\left(1+3^3+...+3^{297}\right)\)
Vậy B chia hết cho 39
Ta có:
\(B=2024\cdot14\)
\(B=2\cdot1012\cdot14\)
\(B=28\cdot1012\)
Vậy B chia hết cho 28