1:5 × (5 - 1 ÷ 5)
2:5 × (5 - (1 ÷ 5))
3:(5 - 1 ÷ 5) × 5
4:(5 - (1 ÷ 5)) × 5
1:8 ÷ (3 - 8 ÷ 3)
2:8 ÷ (3 - (8 ÷ 3))
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