7.8.9.10算24点的答案：1:8 × (9 ÷ (10 - 7))2:8 × 9 ÷(10 - 7)3:(8 × 9) ÷ (10 - 7)4:(8 ÷ (10 - 7)) × 95:8 ÷ (10 - 7) × 96:8 ÷ ((10 - 7) ÷ 9)7:9 × (8 ÷ (10 - 7))8:9 × 8 ÷(10 - 7)9:(9 × 8)...