7778+7878787+878787878+777+1=.........
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![](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)
X x 3:8 - 1912 = 7778
X = 7778 + 1912
X = 9690
X =9690 x 8
X = 77520
X = 77520:3
X = 25840
Đáp số : X = 25840
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 3 : 8 - 1912 = 7778
x * 3 : 8 = 7778 + 1912
x * 3 : 8 = 9690
x * 3 = 9690 * 8
x * 3 = 77520
x = 77520 : 3
x = 25840
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 77782 - 22232 = (7778 - 2223)(7778 + 2223) = 5555 . 10001 = 55555555
=> Hiệu 77782 - 22232 là 1 số gồm toàn các chữ số giống nhau.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
gom vô
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(1111+8889)+(2222+7778)+(4444+5556)
=10000+10000+10000
Đây nha
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 3 : 8 - 1912 = 7778
X x3 : 8 = 7778 + 1912
X x 3 : 8 = 9690
X x 3 = 9690 x 8
X x 3 = 77520
X = 77520 : 3
X = 25840
vây X - 25840
![](https://rs.olm.vn/images/avt/0.png?1311)
886675221
7778+7878787+878787878+777+1=886675221
k nha!