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7.5-2.45+7.5+2.45
7.5-2.45+7.5+2.45
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2020-12-21 20:22
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7.5-2.45+7.5+2.45=（7.5+7.5）+(2.45-2.45)=15+0=15
2020-12-21 20:26:52
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