54321+12345=?df

54321+12345=?df matlab中df=df.';的语法含义是什么 1+1=?DF D DF DF D FD FD F D FDDFDF D FD df(x)=f＇(x)dx df(x)dx=?数学实在很差. 如图所示,AB=CD,AE=DF,CE=BF,求证 AE‖DF 如图CD=AB,DF=BE,AE=CF,求证:DF//BE 如图,AB=CD,AE=DF,CE=BF,求证AE平行DF 如图,AB=CD,AE=DF,CE=BF,求证：AE平行DF AB=CD,AE垂直BC,DF垂直BC,CE=BF,求证AE=DF 已知,AE=DF,BF=CE,AE//df,问ab=cd吗?说明理由. 如图:AB=CD,AE=DF,CE=FB.求证:AE∥DF 已知,AE=DF,BF=CE,AE//DF,问AB=CD吗 如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF 如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF 全等三角形AB=CD,AE=DF,CE=BF,求AE//DF AB=CD,BE=DF,AF=CE求证BE‖DF 已知：如图AB=DE,BC=DF,AF=CE求证：BC//DF