Simplify: 1. 9 – (7 – 8 ÷ 4) 2. 8 – {4 (10 – 8) – 16 ÷ 2} 3. 27 ÷ {8 + (20 ÷ 5 – 3)} 4. 23 + 48 ÷ (3 × 4) 5. (45 ÷ 45) × 819 6. (100 – 45) ÷ (7 × 7)
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