P130第10题 AB AB △x AB a=75°5254″ C An =511606 CAM 4°3412 BN=3433101″ =295°1342P130第10题 295 13 42 343 31 01 4 34 12 51 16 06 75 52 54 =   =   =   =   =     =      BM BN AM AN AB AB AB AB x y t g      