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![](https://rs.olm.vn/images/avt/0.png?1311)
21 tháng 2 2016
Gọi số đó là ab.
Hiệu 2 số là:3ab - ab = 300
Số phải tìm là:300 : (5-1) = 75
![](https://rs.olm.vn/images/avt/0.png?1311)
NK
16 tháng 1 2017
25( đáp án trên violympic lớp 5 ), cách giải thì mình ko rõ nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
HP
27 tháng 2 2016
gọi số đó là ab
Theo bài ra ta có:
3ab=5 x ab
=>300+ab=5 x ab
=>5 x ab-ab=300
=>4 x ab=300=>ab=300:4=75
Vậy số cần tìm là 75
![](https://rs.olm.vn/images/avt/0.png?1311)
2 tháng 5 2015
Gọi 3 số là abc
theo đb ta có
abc1=3 x 2abc
abc x 10 +1 =3x 2000+3abc
7 abc= 5999
abc=857
vậy số đó là 857
20 tháng 10 2018
857 dung 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![](https://rs.olm.vn/images/avt/0.png?1311)
7 tháng 10 2017
Gọi số cần tìm là ab ( a khác 0;a ,b nhỏ hơn 10)
Ta có:
ab x 5=1ab
ab x 5= 100+ab
ab x 5 - ab= 100
ab x 4 = 100
ab = 100 : 4
ab = 25
Vậy số cần tìm là 25
7 tháng 10 2017
Ta gọi số đó là ab, số mới là 1ab
Theo bài ra ta có:
ab * 5 = 1ab
ab * 5 = 100 + ab
ab *4 = 100
ab = 100: 4
ab = 25
Vậy số cần tìm là 25