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dan2018
2 năm trước
bài 1 thực hiện phép tính (tính hợp lí nếu có thể) a, 7/12 - 27/7 . 1/18 b, -5/9 . 13/28 - 13/28 . 4/9 bài 2 tìm x biết a, 4/7 . x - 1/3 = 1/5 b, 8= x - 7/11 .x
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