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khavynguyenthai
2 năm trước
Bài 1.Tử của 1 phân số bé hơn tử số là 13 đơn vị nếu tăng tử số lên 3 đơn vị và giảm mẫu số đi 4 đơn vị thì được phân số mới bằng $\frac{3}{5}$.Tìm phân số ban đầu Bài 2.Một thợ mỏ lập kế hoạch khai thác than,theo đó mỗi ngày phải khai thác được 50 tấn than.Khi thực hiện,mỗi ngày đội khai thác được 57 tấn than.Do đó đội đã hoàn thành kế hoạch trước 1 ngày và còn vượt mức 13 tấn than.Hỏi theo kế hoạch đội phải khai thác bao nhiêu tấn than
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