梯形的梯子AA'‖EE',AB=BC=CD=DE,A'B'=B'C'=C'D'=D'E',AA'=0.5m,EE'=0.

梯形的梯子AA'‖EE',AB=BC=CD=DE,A'B'=B'C'=C'D'=D'E',AA'=0.5m,EE'=0. 如图,梯形的梯子AA'//EE',AB=BC=CD=DE,A'B'=B'C'=C'D'=D'E',AA'=0.5m,EE （2014•五通桥区模拟）如图所示的梯形梯子，AA′∥EE′，AB=BC=CD=DE，A′B′=B′C′=C′D′=D′ aa*bb=caac,dd*ee=dffd,bb*bb=aaff,求a+b+c+d+e+f= AA*BB=CAAC,DD*EE=DFFD,BB*BB=AAFF求A+B+C+D+E+F 如图,AA'//BB'//CC'//DD',且AB=BC=CD,A'B'=B'C'=C'D',AA'=3/DD'=6,求 求各个字母表示的数A B C D E× A---------------EE E E E E A=?B=?C=?D=?E 梯形,AA＇∥BB＇∥CC＇∥DD＇,且AB＝BC＝CD,A＇B＇＝B＇C＇＝C＇D,AA＇=3, 如图,点A’、B'、C’、D'分别在长方形的边AB、BC、CD、DA上,且AA'=BB'=CC'=DD' 已知：如图,点A'、B'、C'、D'分别在正方形的边AB、BC、CD、DA上,且AA'=BB'=CC'=DD'.求证：四 已知：如图,点A’、B’、C’、D’分别在正方形的边AB、BC、CD、DA上,且AA’=BB’=CC’=DD’,求证：四 长方体ABCD-A’B’C’D’中,AB=1,AA’=2,E是侧棱BB’中点,则直线AA’与平面A'D'E所成角的大小是