①5.66-0.96÷6×5
②4.12×6.9-4.12+4.12×1.1
③(1÷0.2+0.2÷1)÷(6-3.4)
④(4.2-0.42)÷3.6+6.4
⑤3.2÷(0.32×0.25)
⑥7.2-1.2×[0.01÷(1-0.9)]
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