tittran1232009 tittran1232009
  • 18-10-2022
  • Mathematics
contestada

Cho góc vuông xoy,điểm A nằm trong góc đó.Gọi B là điểm đối xứng với A qua OX, Gọi C là điểm đối xứng với A qua OY .Chứng minh rằng điểm B đối xứng với điểm C qua O

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