Tính nhẩm :
2 × 5 = ..... 5 × 4 = .....
3 × 5 = ..... 4 × 5 = .....
4 × 5 = ..... 3 × 6 = .....
5 × 5 = ..... 2 × 7 = .....
5 × 8 = ..... 2 × 9 = .....
4 × 8 = ..... 3 × 9 = .....
3 × 8 = ..... 4 × 9 = .....
2 × 8 = ..... 5 × 9 = .....
2 × 5 = 10 5 × 4 = 20
3 × 5 = 15 4 × 5 = 20
4 × 5 = 20 3 × 6 = 18
5 × 5 = 25 2 × 7 = 14
5 × 8 = 40 2 × 9 = 18
4 × 8 = 32 3 × 9 = 27
3 × 8 = 24 4 × 9 = 36
2 × 8 = 16 5 × 9 = 45
-- Mod Toán 2
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