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2 năm trước
Cho A(1;2), B(-1;3) và đường thẳng x-2y+3=0. tìm ảnh A', B' của A,B qua a, phép tịnh tiến vectơ v(1;-1) b, đối xứng qua trục ox c, đối xứng qua trục oy d, đối xứng qua tâm o e, đối xứng quay Q(0;90)
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