1:(5 + 7) ÷ 5 × 102:((5 + 7) ÷ 5) × 103:(5 + 7) ÷ (5 ÷ 10)4:(5 + 7) × 10 ÷ 55:((5 + 7) × 10) ÷ 56:(5 + 7) × (10 ÷ 5)7:10 ÷ 5 ×(5 + 7)8:(10 ÷ 5) × (5 + 7)9:10 ÷ (5 ÷ (5 + 7))10:(10 ×...