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AB/DE=BC/EF=AC/DF=4, 所以AB= 4DE,BC=4EF,AC=4DF 所以AB+BC+AC = 4(DE+EF+DF) 所以(AB+BC+AC)/(DE+EF+DF)= 4 即,△ABC的周長與△DEF的周長的比等於4.
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