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binhnghuyenhong
2 năm trước
Bài 6: Có 12 người thì làm xong một công trình trong 9 ngày. Hỏi nếu có 18 người thì làm xong công trình đó trong mấy ngày ? ( Biết mức làm như nhau. ) Bài 7: Một phép chia có thương là 4 và số dư là 5. Tổng của số bị chia, số chia và số dư là 70. Tìm số bị chia và số chia.
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