求证be//df

如图CD=AB,DF=BE,AE=CF,求证:DF//BE如图CD=AB,DF=BE,AE=CF,求证:DF//BE如图CD=AB,DF=BE,AE=CF,求证:DF//BE∵CD=AB,DF=BE,

AB=CD,BE=DF,AF=CE求证BE‖DFAB=CD,BE=DF,AF=CE求证BE‖DFAB=CD,BE=DF,AF=CE求证BE‖DFBE=DF可得BE-EF=DF-EFAE=CFAB=CD

AB=CD,DF垂直AC,BE垂直AC,DF=BE.求证:AF=CEAB=CD,DF垂直AC,BE垂直AC,DF=BE.求证:AF=CEAB=CD,DF垂直AC,BE垂直AC,DF=BE.求证:AF=

AB=CD,AF=CE,BE⊥AC,DF⊥AC,求证BE=DFAB=CD,AF=CE,BE⊥AC,DF⊥AC,求证BE=DFAB=CD,AF=CE,BE⊥AC,DF⊥AC,求证BE=DF回答不易,请采

平行四边形d是ab中点ef平行abdf平行be求证AE,DF互相平分平行四边形d是ab中点ef平行abdf平行be求证AE,DF互相平分平行四边形d是ab中点ef平行abdf平行be求证AE,DF互相

如图,AE=FC,AB=CD,BE=DF,∠F=∠ADF,求证DF‖BE如图,AE=FC,AB=CD,BE=DF,∠F=∠ADF,求证DF‖BE如图,AE=FC,AB=CD,BE=DF,∠F=∠ADF

E、F是平行四边形ABCD对角线AC上两点,连接BE、DF,且BE=DF,求证：BEDF是平行四边形.E、F是平行四边形ABCD对角线AC上两点,连接BE、DF,且BE=DF,求证：BEDF是平行四边

嘻嘻如图,AB=DE,AC=DF,BE=CF,求证AB//DE,AC//DF嘻嘻如图,AB=DE,AC=DF,BE=CF,求证AB//DE,AC//DF嘻嘻如图,AB=DE,AC=DF,BE=CF,求

如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.如图,已知AB⊥BC,AE⊥EF,AC=DF

如图,已知AB＝DE,AC＝DF,BE＝CF．求证：AC‖DF.如图,已知AB＝DE,AC＝DF,BE＝CF．求证：AC‖DF.如图,已知AB＝DE,AC＝DF,BE＝CF．求证：AC‖DF.∵BE＝

如图,AB=DE,AC=DF,BE=CF.求证AB‖DE,AC‖DF.如图,AB=DE,AC=DF,BE=CF.求证AB‖DE,AC‖DF.如图,AB=DE,AC=DF,BE=CF.求证AB‖DE,A

如图,已知AB⊥BC,DE⊥EF,AC=DF,BE=CF.求证：AC‖DF如图,已知AB⊥BC,DE⊥EF,AC=DF,BE=CF.求证：AC‖DF如图,已知AB⊥BC,DE⊥EF,AC=DF,BE=

如图,AB=DE,AC=DF,BE=CF,求证AB平行DE,AC平行DF如图,AB=DE,AC=DF,BE=CF,求证AB平行DE,AC平行DF 如图,AB=DE,AC=DF,BE=CF,求

如图,已知:AD=BE,AC=DF,且AC∥DF,求证:BC∥EF如图,已知:AD=BE,AC=DF,且AC∥DF,求证:BC∥EF如图,已知:AD=BE,AC=DF,且AC∥DF,求证:BC∥EF∵

如图,AB＝DE,AC等于DF,BE＝CF.求证AB∥DE,AC∥DF.如图,AB＝DE,AC等于DF,BE＝CF.求证AB∥DE,AC∥DF.如图,AB＝DE,AC等于DF,BE＝CF.求证AB∥D

AE垂直BC,DF垂直BC,E,F是垂足,且AE=DF,AB=DC,求证CF=BE.AE垂直BC,DF垂直BC,E,F是垂足,且AE=DF,AB=DC,求证CF=BE. AE垂直BC,DF垂

如图:DC=BE,AB=DF,AB‖DF,求证△ABC≌△FDE如图:DC=BE,AB=DF,AB‖DF,求证△ABC≌△FDE如图:DC=BE,AB=DF,AB‖DF,求证△ABC≌△FDE∵AB∥

如图,已知∠ADE=60°,DF平分∠ADE,∠1=30°,求证:DF∥BE证明：∵DF平分∠ADE（已知）∴（）=½∠ADE（）∵∠ADE=60°（已知）∴（）=30°（）∵∠1=30°如

已知∠ADE=60°,DF平分∠ADE,∠1=30°,求证：DF‖BE.证明：∵DF平分∠ADE（已知)∴_____=2分之1∠ADE（）又∵∠ADE=60°（已知）∴____=30°（）又∵∠1=3

△ABC中,AB=AC,AD是高,DE⊥AB于E,DF⊥DF于E,DF⊥于F.求证：BE=CF△ABC中,AB=AC,AD是高,DE⊥AB于E,DF⊥DF于E,DF⊥于F.求证：BE=CF△ABC中,