Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](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)
\(2222^{5555}=2^{5555}.1111^{5555}=\left(2^5\right)^{1111}.1111^{5555}=32^{1111}.1111^{5555}\)
\(5555^{2222}=5^{2222}.1111^{2222}=\left(5^2\right)^{1111}.1111^{2222}=25^{1111}.1111^{2222}\)
\(32^{1111}.1111^{5555}>25^{1111}.1111^{2222}\Rightarrow2222^{5555}>5555^{2222}\)
vậy \(2222^{5555}>5555^{2222}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=2222^5555 +4^5555 +5555^2222 -4^2222-(4^5555 -4^2222)
=(2222+4).M +(5555-4).N -(4^3333.4^2222 -4^2222)
=(2222+4).M +(5555-4).N -4^2222(4^3333-1)
==(2222+4).M +(5555-4).N --4^2222 (64^1111-1)
==(2222+4).M +(5555-4).N -4^2222(63K)
ta thấy 2222+4=2226 chia hết 7
5555-4 =5551 chia hết cho 7
63 chia hết cho 7
-=>(2222^5555) + (5555^2222) chia hết cho 7
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 5. (10 . 1 +9 . 10 +8 . 100+7.1000 +....+1 . 1000000000)
A = 5. (10 + 90 +800 +7000 +60000 +500000 +4000000 +30000000 +200000000+1000000000)
A =5 . 12345678900
A=6172839500
88 + 888 + 8 + 8 + 8 = 1000
555 + 55 + 55 + 55 + 55 + 55 + 55 + 55 + 55 + 5 = 1000