|xαα||αxα||ααx|

|xαα|
|αxα|
|ααx|
【正确答案】：|α α α| |α x α| |α α x| = |x+2α α α| |x+2α x α| |x+2α α x| =(x+2α) |1 α α| |1 x α| |1 α x| =(x+2α) |1 α α | |0 x-α 0 | |0 0 x-α| =(x+2α)(x-α)²