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1) (6 + 4) ÷ 2 × 8
2) 12 + (4 – 3) × (18 ÷ 3)
3) 100 – [ (16 ÷ 4) × (9 + 3)]
4) 160 ÷ {4 × [(18 - 6 + 3) + 5]}
5) {9 × [(18 ÷ 3) + 4]} ÷ 9

please help