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tn9535895
2 năm trước
Có một vòi chảy vào một bể chứa nước, mỗi phút được x lít nước. Cùng lúc đó một vòi khác chảy từ bể ra Mỗi phút lượng nước chảy ra bằng 1/3 lượng nước chảy vào. a) Hãy biểu thị số nước có thêm trong bể sau khi đồng thời mở cả hai vòi trên trong a phút. b) Tính số nước có thêm trong bể trên biết x = 30; a = 50
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