2/5:5/7,4:0.8.7/6:3化简

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2/5:5/7,4:0.8.7/6:3化简
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2/5:5/7,4:0.8.7/6:3化简
2/5:5/7,4:0.8.7/6:3化简

2/5:5/7,4:0.8.7/6:3化简