giúp mình với hứa 5sao+cảm ơn+hay nhất Một xí nghiệp cơ khí được giao sản xuất 500 máy bơm nước trong một thời gian nhất định.Do cải tiến kỹ thuật tăng năng xuất lao động,mỗi ngày xí nghiệp sản xuất thêm 5 máy bơm nên chẳng những xí nghiệp hoàn thành sớm công sớm 1 ngày mà còn sản xuất thêm được 70 máy bơm nữa.Hỏi số máy bơm dự định sản xuất trong một ngày và số máy bơm dự định theo kế hoạch ban đầu.

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