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23
1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
Tìm số nguyên dương nhỏ nhất sao cho số đó chia 2 dư 1, chia 3 dư 2, chia 4 dư 3, chia 5 dư 4, chia 6 dư 5, chia 7 dư 6, chia 8 dư 7, chia 9 dư 8, chia 10 dư 9.
Gọi xx là số cần tìm ta có
x+1⋮2;3;4;5;6;7;8;9;10x+1⋮2;3;4;5;6;7;8;9;10
Suy x+1x+1 là [2,3,4,5,6,7,8,9,10][2,3,4,5,6,7,8,9,10]
Suy ra x=[2,3,4,5,6,7,8,9,10]−1x=[2,3,4,5,6,7,8,9,10]−1
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6*6*6*6*6*6*6=279936
3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 =4782969
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a) 6 x 2 = 12 6 x 3 = 18 6 x 8 = 48 6 x 1 = 6
6 x 4 = 24 6 x 5 = 30 6 x 9 = 54 1 x 6 = 6
6 x 6 = 36 6 x 7 = 42 6 x 10 = 60 0 x 6 = 0
b) 6 x 5 = 30 6 x 4 = 24 3 x 6 = 18 2 x 6 = 12
5 x 6 =30 4 x 6 = 24 6 x 3 = 18 6 x 2 =12
![](https://rs.olm.vn/images/avt/0.png?1311)
5 x 6 = 30 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24
6 x 5 = 30 6 x 2 = 12 6 x 3 = 18 6 x 4 = 24
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6 x 2 =12
3 x 6 = 18
6 x 5 = 30
2 x 6 = 12
6 x 3 = 18
5 x 6 = 30
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6 x [4] = 4 x 6 5 x 6 = 6 x [5]
3 x 5 = 5 x [3] 2 x 3 = [3] x 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3 x 5 < 3 x 6
3 x 5 > 3x 4
b) 3 x 5 = 5 x 3
4 x 6 = 6 x 4
c) 20 : 4 > 20 : 5
20 : 4 < 20 : 2
x : 6 = 3 ( dư 2 )
X = 3x6 + 2
X = 18 + 2
X = 20
:6=3dư2
x=3x6+2
x=18+2
x=20
#học tốt#