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giangtrananvu
2 năm trước
Giải bài toán = cách lập pt bài 1:hai thùng dầu, thùng này gấp đôi thùng kia , sau khi thêm vào thùng nhỏ 15 lít, bớt ở thùng lớn 30 lít thì số dầu 2 thùng = nhau. tính số dầu ở mỗi thùng ban đầu
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