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minhduong2005
2 năm trước
bốn đội máy san đất làm 4 khối lượng công việc như nhau. Đội 1 hoàn thành công việc trong vòng 4 ngày, đội 2 trong 6 ngày, đội 3 trong 10 ngày, đội 4 trong 12 ngày. Hỏi mỗi đội có bao nhiêu máy(có cung năng suất) biết cả 4 đội có 72 máy?
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