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thuhong08112002
2 năm trước
cho góc xOy.tia oz là tia phân giác của góc xoy,lấy điểm a thuộc tia oz(a ko bang o).kẻ ab vuông góc với OX,AC vuông góc với Oy.chứng minh tam giác OAB= tam giác OAC. mik đang cần gấp
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