若a:b=5:4,b:c=9:7,那么a:c=():()

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若a:b=5:4,b:c=9:7,那么a:c=():()
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若a:b=5:4,b:c=9:7,那么a:c=():()
若a:b=5:4,b:c=9:7,那么a:c=():()

若a:b=5:4,b:c=9:7,那么a:c=():()
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