Simple problems like this make many people do wrong because they are too confident. Calculate and find the correct answer. Can you solve it within 10 seconds?
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NHI NHI
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Emotion
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Source
![[Photo] Chu Dau Ceramics – Proud of Vietnamese identity at Exhibition A80](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/c62ab2fc69664657b3f03bea2c59c90e)
![[Photo] Celebration of the 65th Anniversary of the Establishment of Diplomatic Relations between Vietnam and Cuba](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/0ed159f3f19344e497ab652956b15cca)
![[Photo] National Assembly Chairman Tran Thanh Man receives Cambodian Senate President Hun Sen](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/7a90c9b1c1484321bbb0fadceef6559b)
![[Photo] General Secretary receives heads of political party delegations from countries attending the 80th anniversary of our country's National Day](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/ad0cb56026294afcae85480562c2e790)
![[Photo] Solemn reception to celebrate the 80th anniversary of the National Day of the Socialist Republic of Vietnam](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/e86d78396477453cbfab255db1e2bdb1)
![[Photo] People eagerly wait all night for the parade on the morning of September 2](https://vphoto.vietnam.vn/thumb/1200x675/vietnam/resource/IMAGE/2025/9/1/0cf8423e8a4e454094f0bace35c9a392)
![[Infographic] A week of strong fluctuations, gold prices continuously set historical peaks](https://vphoto.vietnam.vn/thumb/402x226/vietnam/resource/IMAGE/2025/9/1/1520fa24c9c94c39afee9a58ceb09de1)
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