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AB=CD,AD=BC AB=CD,AB∥CD AB=CD,AD∥BC AB∥CD,AD∥BC
AB>2CD AB=2CD AB<2CD 不能确定
CD=2AC CD=3AC CD=4BD 不能确定
∠ =∠C B. ∠ADC=∠AEB BE=CD,AB=AC AD∶AC=AE∶AB
)BE=DE ( )AB∥CD ( )∠A.=∠C.( )AB=CD
∠1=∠2 ∠3=∠4 ∠5=∠B ∠B+∠BDC=180°
)AB=AD,BC=CD ( )∠A.=∠ ,∠B.=∠ (C.)AB∥CD,AB=CD (D.)AB=CD,AD=BC
AB=CD,AD=BC AB∥CD,AB=CD AB=CD ,AD∥BC AB∥CD,AD∥BC
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC
AB>CD AB=CD AB不能确定
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC
AB=CD,AC=BD AB=CD,∠ABC=∠BCD ∠ABC=∠DCB,∠A.=∠D AB=CD,∠A.=∠D.
∠1=∠2 ∠3=∠4 ∠5=∠B. ∠B.+∠BDC=180°
∠HEG =∠EGF ∠EHF +∠CFH =180° ∠AEG =∠DGE ∠EHF =∠CFH
∠A.=∠C ∠ =∠D B.AB∥CD AD=BC AB∥CD ∠A.=∠C AB∥CD AB=CD
AB<CD AB=CD AB>CD 不能确定
∠1=∠2 ∠3=∠4 ∠5=∠B ∠B+∠BDC=180°
AB∥CD,AB=CD ∠A.=∠ ,∠B.=∠ C.AB=AD,BC=CD D.AB=CD,AD=BC
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC