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Vì BCNN(7,14)=14 nên sau 14 ngày thì 2 bạn cùng trực
Nếu lần đầu vào thứ 2 thì lần tiếp theo là thứ 2 của 2 tuần sau
Gọi số a ngày sau thi 3 tàu cùng cập bến
a chia hết cho 15;12;20
15 = 3.5 ; 12 = 22.3 ; 20 = 22.5
=> BCNN(15;12;20) = 22.3.5 = 60
Vậy a = 60
60 : 7 = 8 dư 4
Vậy hôm đó là thứ 6 + 4 = 10 hay là thứ 3
Gọi số ngày ít để 2 bạn gặp nhau là x
Theo bài ra ta có :
x chia hết cho 8 ; x chia hết cho 10 ; x là số nhỏ nhất khác 0
=> x ∈ BCNN(8;10)
lại có: 8=2\(^3\); 10=2.5
=> BCNN(8;10) =2\(^3\). 5 = 40
=> x=40
Vậy sau ít nhất 40 ngày thì Lan và Minh lại đến thư viện.
Sau ít nhất 24 ngày thì ba bạn cùng trực nhật lại trong 1 ngày vì BCNN(4;8;6)=24
=>Ngày đó là ngày thứ 6
Ko biết suy nghĩ của tôi dung ko vì tôi lấy 24chia cho 1tuan = ngày thứ 4
Gọi số ngày để hai bạn gặp nhau là a
=> \(a\in BC\left(24;18\right)\)
Để a có giá trị nhỏ nhất => \(a=BCNN\left(24;18\right)\)
Ta có:
24 = 23.3
18 = 32.2
=> BCNN(21;18) = 32.23=72
Vậy sau 72 ngày hai bạn sẽ cùng gặp nhau
Ta có \(\hept{\begin{cases}4=2^2\\6=2.3\\8=2^3\end{cases}\Rightarrow BCNN\left(4,6,8\right)=2^3.3=24}\)
Vậy sau ít nhất 24 ngày thì ba bạn lại trực nhật cùng nhau.
\(20=2^2.5\) \(30=2.3.5\)
=> ƯCLN \(\left(20,30\right)=2^2.3.5=60\)mà do Đạt và Việt đến thư viện lần đầu vào cùng ngày
=> Sau ít nhất 60 ngày thì hai bạn lại cùng đến thư viện.
1+1=
222 ngày
Khi đó là Mr beat hoặc cr7 thui nha ...
Số 8 nằm ngang + số 8 nằm ngang =
20 ngày
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