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Trong 1 ngày 2 người làm được: 1 : 6 = 1/6 công việc.
Trong 4 ngày 2 ngày làm được: 4 *1/6 = 2/3 công việc.
Số công việc còn lại là: 1 – 2/3 = 1/3 công việc.
Trong 1 ngày Long làm được: 1/3 : 5 = 1/15 công việc.
Long làm 1 mình trong: 1 : 1/15 = 15 ngày sẽ xong công việc.
Trong 1 ngày Thành làm được: 1/6 – 1/15 = 1/10 công việc.
Thành làm 1 mình: 1 : 1/10 = 10 ngà
Giải
Trong 1 ngày hai người làm được là :
1 : 6 = 1/6 ( công việc )
Trong 4 ngày 2 người làm được là :
4 x 1/6 = 2/3 ( công việc )
Số công việc còn lại là :
1 - 2/3 = 1/3 ( công việc )
Trong một ngày Long làm được là :
1/3 : 5 = 1/15 ( công việc )
Long làm một mình trong số ngày sẽ xong công việc là :
1 : 1/15 = 15 ( ngày )
Trong một ngày Thành làm được là :
1/6 - 1/15 = 1/10 ( công việc )
Thành làm 1 mình trong số ngày là :
1 : 1/10 = 10 ( ngày )
Đáp số : 10 ngày
bạn ơi, cảm ơn bạn vì đã trả lời bài đó giúp mình nhưng bài giải của bạn là sai nha T~T
Nếu chỉ có người thứ hai làm thì công việc đó sẽ xong trong:
5 x 6 : (6 - 4) = 15 (ngày)
1 ngày cả 2 người làm được
1 : 6 = 1/6 (công việc)
1 ngày người thứ 2 làm được:
1 : 15 = 1/15 (công việc)
1 ngày người thứ nhất làm được:
1/6 - 1/15 =1/10 (công việc)
Người thứ nhất làm công việc đó trong:
1 : 1/10 = 10 (ngày)
Đáp số: 10 ngày
Trong 1 ngày,Kiên và Giang làm được 1/6 công việc nên trong 4 ngày,2 người làm chung thì được : 1/6 x 2 = 1/3 (công việc)
Sau khi Kiên ốm,Giang phải làm : 1 - 1/3 = 2/3 (công việc)
Trong 1 ngày,Giang làm được : 2/3 : 5 = 2/15 (công việc)
Trong 1 ngày,Kiên làm được : 1/6 - 2/15 = 1/30 (công việc)
Giang làm 1 mình thì xong việc trong : 1 : 2/15 = 15/2 (ngày)
Kiên làm 1 mình thì xong việc trong : 1 : 1/30 = 30 (ngày)
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