Mathematics, 24.07.2021 01:00 cristykianpour

Ở 1 nhà trẻ, 1 cô trông 7 cháu. Về sau có 4 cháu chuyển đi nơi khác và nhà trẻ được bổ sung thêm 2 cô mới nên mỗi cô chỉ phải trông 5 cháu. Hỏi lúc đầu nhà trẻ có bao nhiêu cháu? Bao nhiêu cô?

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Ở 1 nhà trẻ, 1 cô trông 7 cháu. Về sau có 4 cháu chuyển đi nơi khác và nhà trẻ được bổ sung thêm 2 c...

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