Question

九年级上册数学青岛版新课标互动同步训练6页的第6题怎么做。急......

Answer 1

　　证明：∵ ∠B=90°                                  

　　           ∴ AB⊥BC                                

　　           ∵ MD⊥BC                                ∵∠ABD=∠DAC

                      ∴ ∠MBC=90°                       ∴∠BAD=∠D

　　               ∴  AB//MD                            ∴∠ MAD=∠D∴MD=MA

　　                                                             

 

                

                                                     

　　         

Answer 2

在△ABC中，∠B等于90°，M是AC上任意一点（M与A不重合），MD⊥BC,交∠BAC的平分线于点D，求证：MD＝MA.

Answer 3

最好能把题目写出来