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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
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
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
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một ngày cả 2 người làm dc
\(1:6=\frac{1}{6}\left(cv\right)\)
4 ngày cả 2 người làm dc
\(\frac{1}{6}x4=\frac{2}{3}\)(cv)
Số cv còn lại tài phải làm
\(1-\frac{2}{3}=\frac{1}{3}\left(cv\right)\)
Một ngày tài làm dc
\(\frac{1}{3}:5=\frac{1}{15}\left(cv\right)\)
một mình tài làn trong
\(1:\frac{1}{15}=15\left(ng\right)\)
một ngày hùng làm dc
\(\frac{1}{6}-\frac{1}{15}=\frac{1}{10}\left(cv\right)\)
một mình hùng làm trong
\(1:\frac{1}{10}=10\left(ng\right)\)
đs....................
tui có học lớp 4 à sao mà biết được toán lớp 5
thù đừng làm