Đ ề thi TIMO Vòng Qu ố c Gia 2025 - 2026 K h ố i 6 Ms Huy ề n: 0965.865.940 find the value of (12 ⊗ 4) ⊗ 6 Define: Đ ị nh nghĩ a; Operation symbol: Ký hi ệ u phép toán; Value: Giá tr ị . C âu 12. How many simplified positive proper fractions with denominator 1225 are there? Simplified positive proper fraction: Phân s ố t ố i gi ả n, nh ỏ hơn 1; Denominator: M ẫ u s ố . C âu 13. A 10 - digit number 528 荝 70721 荞 is divisible by 24. Find the smallest value of A×B. 10 - digit number: S ố có 10 ch ữ s ố ; Divisible by: Chia h ế t cho; Smallest: Nh ỏ nh ấ t; Value: Giá tr ị . C âu 14. What is the 3 - digit positive integer that is divisible by 32, 48, and 64, and has a unit digit of "0"? 3 - digit positive integer: S ố nguyên dương có 3 ch ữ s ố ; Divisible by: Chia h ế t cho; Unit digit: Ch ữ s ố hàng đơn v ị . C âu 15. Find the unit digit of 2 1 + 2 2 + 2 3 + 2 4 + … + 2 2024 + 2 2025 + 2 2026 C âu 16. Given triangle ABC with point D lying on line segment AC. The ratio of AD and DC is 5:6, and the area of triangle BCD is 72. Find the area of triangle ABC. Đ ề thi TIMO Vòng Qu ố c Gia 2025 - 2026 K h ố i 6 Ms Huy ề n: 0965.865.940 Triangle: Hình tam giác; Point: Đi ể m; Line segment: Đo ạ n th ẳ ng; Ratio: T ỉ s ố ; Area: Di ệ n tích. C âu 17. Given an 18 - sided regular polygon. The measurement of its interior angle is A o . The measurement of its exterior angle is B o . Find the difference of A and B. 18 - sided regular polygon: Đa giác đ ề u 18 c ạ nh; Measurement: S ố đo; Interior angle: Góc trong; Exterior angle: Góc ngoài; Difference: Hi ệ u. C âu 18. A solid cuboid is formed by merging 6 cubes with a side length of 3 cm. Find the largest value of the total surface area o f the cuboid in cm². Solid: Đ ặ c; Cuboid: Hình h ộ p ch ữ nh ậ t; Merge: Ghép; Cube: Hình l ậ p phương; Side length: Đ ộ dài c ạ nh; Largest: L ớ n nh ấ t; Value: Giá tr ị ; Total surface area: Di ệ n tích toàn ph ầ n. C âu 19. How many rectangles containing exactly 2 “*” are there in the figure
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