①在△ABC和△DEF中,AB/DE=BC/EF=AC/DF=4,求△DEF的周长之比 ②m :n=1/7:1/6,n:t=1/4:1/3,则m:n:t=?①在△ABC和△DEF中,AB/DE=BC/EF=AC/DF=4,求△DEF的周长之比②m :n=1/7:1/6,n:t=1/4:1/3,则m:n:t=?
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