1 = 7 × 4, 2 = 9 × 5, 3 = 6 × 8, 4 = 8 × 7, 5 = 4 × 9, 6 = 5 × 6 + 4, 7 = 3 × 12, 8 = 8 × 3 + 6, 9 = 7 × 5 + 2, 10= 9 × 4 + 3, 11= 6 × 6 + 5, 12= 4 × 7 + 8, 13 = 25 + 18, 14 = 40 – 17, 15 = 36 + 9, 16 = 50 – 23, 17= 3 × 9 + 7, 18= 5 × 8 – 6, 19= 7 × 6 + 5, 20= 9 × 3 + 4.

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