1,2,6,7怎么算等于24如题

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1:(1 + 7) ÷ 2 × 62:((1 + 7) ÷ 2) × 63:(1 + 7) ÷ (2 ÷ 6)4:(1 - 7) × (2 - 6)5:(1 + 7) × 6 ÷ 26:((1 + 7) × 6) ÷ 27:(1 + 7) × (6 ÷ 2)8:(2 - 6) × (1 - 7)9:2 × (6 - 1 + 7)10:2 × ((6 - 1) + 7...