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A = 2014+2014^2+2014^3++2014^4+...+2014^100
2014 . A = 20142 + 20143 + 20144 + 20145 + ... + 2014101
2014 . A - A = ( 20142 + 20143 + 20144 + 20145 + ... + 2014101 ) - ( 2014 + 20142 + 20143 + 20144 + ... + 2014100 )
2013 . A = 2014101 - 2014
A = ( 2014101 - 2014 ) : 2013
Ta có:
A = 2014 + 20142 + 20143 + 20144 + ... + 2014100
2014A = 20142 + 20143 + 20144 + 20145 + ... + 2014101
2014A - A = (20142 + 20143 + 20144 + 20145 + ... + 2014101) - (2014 + 20142 + 20143 + 20144 + ... + 2014100)
2013A = 2014101 - 2014
A = \(\frac{2014^{101}-2014}{2013}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)2014 + 2014^2 + 2014^3 + ... + 2014^10
=(2014+2014^2)+(2014^3+2014^4)+...+(2014^9+2014^10)
=2014(1+2014)+2014^3(1+2014)+...+1014^9(1+2014)
=2014.2015+2014^3.2015+...+2014^9.2015
vì 2014.2015 chia hết cho 2015
2014^3.2015 chia hết cho 2015
.....
2014^9.2015 chia hết cho 2015
=>2014.2015+2014^3.2015+...+2014^9.2015 chia hết cho 2015
vậy 2014 + 2014^2 + 2014^3 + ... + 2014^10 chia hết cho 2015
a,2014+20142+20143+....+201410
=(2014+20142)+(20143+20144)+.....+(20149+201410)
=2014.(1+2014)+20143.(1+2014)+.........+20149.(1+2014)
=2014.2015+20143.2015+..........+20149.2015
=2015.(2014+20143+...........+20149) \(^._:\)2015 (đpcm)
b,4n+1\(^._:\)n+1
4n+4 -3\(^._:\)n+1
Vì 4n+4\(^._:\)n+1 =>3\(^._:\)n+1
=>n+1\(\in\){1; -1; 3; -3}
n+1 | n |
1 | 0 |
-1 | -2 |
3 | 2 |
-3 | -4 |
KL: n\(\in\){0; 2; -2; -4}
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