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Khi thêm vào số bé số a và bởi ở số lớn số a thì tổng không thay đổi .
Ta coi số bé là 1 phần thì số lớn là 4 phần bằng nhau như thế .
Tổng 2 số là : 14,78 + 2,87 = 17,65
Số a là : 17,65 : ( 4 + 1 ) - 2,87 = 0,66
Đ/S : 0,66
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Mình sao chép rồi đó , số 9 ở chỗ mình vừa đánh dấu