1) 1000 - 45 ÷ 5 - 1 = 1000 - 9 - 1 = 990;
2) 8 × (41 - 38) ÷ 3 = 8 × 3 ÷ 3 = 8;
3) 7 × (25 ÷ 5 - 4) = 7 × (5 - 4) = 7;
4) 21 ÷ (34 - 27) × 2 = 21 ÷ 7 × 2 = 6;
5) (12 ÷ 4 - 3) × 3 = (3 - 3) × 3 = 3;
6) 600 + 32 ÷ 4 - 8 = 600 + 8 - 8 = 600.
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