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hnkimchau
2 năm trước
cho 4 số 4 ; 6; 8 và số x chưa biết . Tìm STN x để số x cùng với 3 số trên lập thành các cặp bằng nhau . Có mấy giá trị của x thỏa mãn , viết các cặp phân số bằng nhau .
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