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        ώPc(din)ƽ׺γģ(9)

        ԴW(sh)W(wng) ߣώ 2010-10-11 10:34:17

        ܃(ni)

         

        (x)֪DDEքeǡABC߅ABACc(din)F(xin)DEc(din)DFGĺ߅AEFGeıǶ٣

        ?yn)FDEFc(din)ԡCFD=CEFAFE=AFD

        ?yn)EACc(din)ԡCEF=AEF

        ԡCFD=CEF=AEF

        ԡCFA:CFD=2:1

        (j)βAGF:DGF=CFA:CFD=2:1

        ԡDFGAEFG=12+1+2=15

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