A:being held
B:holding
C:to be held
D:held
如图,在菱形ABCD中,过点B作BE⊥AD,BF⊥CD,垂足分别为点E,F,延长BD至G,使得DG=BD,连结EG,FG,若AE=DE,则 EGAB =____.
已知:|a|=3,b2=5,且|a+b|=a+b,则a﹣b的值为( )