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abc x 17 = 6000 + abc
abc x 17 - abc = 6000
abc x (17-1) = 6000
abc = 6000 : 16
abc = 375
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
abc = 6abc : 17
6abc = abc * 17
6000 + abc = abc * 17
6000 = abc * 16
abc = 6000 : 16
abc = 375
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2. 314 cm2
3. số các số là: (2022-2):10+1 = 203 số
2x12x22x32x42x..........x2002x2012x2022 = (2x12x22x32)....(1962x1972x1982x1992)x(2002x2012x2022)
= (...6)....(...6)x(...8)
= ... 8
vậy chữ số tận cùng là 8
duyệt đi
![](https://rs.olm.vn/images/avt/0.png?1311)
abc = 6abc : 17 => 17 x abc = 6000 + abc
=> 16 x abc = 6000
=> abc = 6000 : 16 = 375
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![](https://rs.olm.vn/images/avt/0.png?1311)
abc1-1abc=7506
(10abc+1)-(1000+abc)=7506
10abc+1-1000-abc=7506
10abc-abc=7506+1000-1
(10-1)abc=8505
9abc=8505
abc=8505:9
abc=945
17 x abc = 6000 + abc => 16 x abc = 6000
abc = 6000 : 16 = 375
Vậy abc = 375