已知:AD=BE 求证:AC·DF=BC·EF
图,已知AD=BE,BC平行EF,BC=EF 求证 AC=DF
如图,已知:AD=BE,AC=DF,且AC∥DF,求证:BC∥EF
如图,已知AD=BE,AC=DF,BC=EF.求证:△ACB≌△DFE;求证:AC∥DF
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.
已知:平行四边形ABCD中,过对角线AC中点O的直线EF交AD于F,BC于E.求证:BE=DF.
如图,已知BE=DF,AC=CF,AE‖CF.求证:AD‖BC.
如图,已知AD=CB,BE垂直AC于点E,DF垂直AC于点F,BE=DF,求证;AD//BC.
已知如图,AD=BE,AC=DF,BC=EF,证:△ABC≌△DEF.
如图,已知AC⊥BC,AD⊥BD,AD=BC,CE⊥AB,垂足分别为、EF求证CE=DF
已知,如图,AD=BC,AE=CF,BE⊥AC,DF⊥AC,垂足分别为E,F,求证;DF=BE