【简答题】已知:如图BE∥CF,BE、CF分别平分∠ABC和∠BCD,求证:AB∥CD 证明:∵BE、CF分别平分∠ABC和∠BCD(已知) ∴∠1= ∠ _________ ∠2= ∠ _________ ( _________ ) ∵BE∥CF( _________ ) ∴∠1=∠2( _________ ) ∴ ∠ABC= ∠BCD 即∠ABC=∠BCD ∴AB∥CD( _________ )。
【判断题】AIBN+CF 2 =CF 2 能进行自由基聚合。( )
【简答题】What are the thoughts you may get after learing "Discovering Problems: Slim is Beautiful?"
【单选题】May 1610, 120 years after , is still a perilous journey.
【单选题】May is after(在...之后)________.
【简答题】如图,已知AB⊥CF,DE⊥CF,垂足分别为B、E,AB=DE,请添加一个适当条件,使△ABC≌△DEF,并予以证明。 已知:AB⊥CF,DE⊥CF,AB=DE,_______________。 求证:△ABC≌△DEF。
【简答题】如图,AD ∥ BE ∥ CF,AB=AD=1,BE=2,CF=4,则BC=______.
【简答题】8 They may remain hungry after dinner since the food is even not offered a second time after their polite initially decline
【简答题】已知:如图BE//CF,BE、CF分别平分∠ABC和∠BCD,求证:AB//CD 。 证明:∵BE、CF分别平分∠ABC和∠BCD(已知) ∴∠1= ∠( ),( ) ∵BE//CF(已知) ∴∠1=∠2( ) ∴∠ABC=∠BCD ∴AB//CD( )