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5 tháng 11 2016
bai nay trong violympic
=10989
minh dam bao100%vi minh da lam bai nay roi va dung
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
10989
Bài 1:
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5Coverline&space;%7Babcde%7D&space;%5Ctimes&space;9&space;=&space;%5Coverline&space;%7Bedcba%7D$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CRightarrow$&space;$a=1$&space;$%5CRightarrow$&space;$e=9$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CRightarrow&space;%5Coverline&space;%7B1bcd9%7D&space;%5Ctimes&space;9&space;=&space;%5Coverline&space;%7B9dcb1%7D$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CLeftrightarrow&space;%2810009+10&space;%5Coverline&space;%7Bbcd%7D%29&space;%5Ctimes&space;9&space;=&space;90001&space;+&space;10&space;%5Coverline&space;%7Bdcb%7D$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CLeftrightarrow&space;8&space;+&space;9&space;%5Coverline&space;%7Bbcd%7D&space;=&space;%5Coverline&space;%7Bdcb%7D$)
Hoặc b=0
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CRightarrow&space;b=0$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CRightarrow&space;d=8$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5CRightarrow&space;%5Coverline&space;%7B10c89%7D&space;%5Ctimes&space;9&space;=&space;%5Coverline&space;%7B98c01%7D$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$98001&space;%5Cle&space;%5Coverline&space;%7B10c89%7D&space;%5Ctimes&space;9&space;=&space;%5Coverline&space;%7B98c01%7D&space;%5Cle&space;98901$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$10889&space;%5Cle&space;%5Coverline&space;%7B10c89%7D&space;%5Cle&space;10989$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$10889&space;%5Ctimes&space;9&space;=&space;98001$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$10989&space;%5Ctimes&space;9&space;=&space;98901$)
![](http://latex.codecogs.com/gif.latex?%5Cfn_jvn&space;$%5Coverline&space;%7Babcde%7D=10989$)
(loại b=1)
Vậy