题1:1:(7 - 5) × 7 + 102:((7 - 5) × 7) + 103:(7 × (7 - 5)) + 104:7 × (7 - 5) + 105:10 + (7 - 5) × 76:10 + ((7 - 5) × 7)7:10 - (7 × (5 - 7))8:10 - 7 ×(5 - 7)9:10 + (7 × (7 - 5))10:10 + 7 ×(7 -...