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Giả sử đồ thị cắt trục hoành tại điểm C thì C thuộc tia đối của tia Ox và tam giác OAC vuông cân tại O.[r]
Toán 9 Kiểm tra Chương 2 Đại số [123doc] đề kiểm tra chương ii Đại Số 9
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