trong không gian với hệ trục tọa độ oxyz hình chiếu của điểm m(-1,0,3) theo phương vecto v=(1,-2,1) trên mặt phẳng x-y+z+2 = 0 có tọa độ là:

A.(2,-2.,-2)                                  B.(-1,0,1)                              C.(-2,2,2)                          D.(1,0,-1)

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