①2χ+0.4=0.36×5

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①2χ+0.4=0.36×5①2χ+0.4=0.36×5①2χ+0.4=0.36×5 

①2χ+0.4=0.36×5
①2χ+0.4=0.36×5

①2χ+0.4=0.36×5