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Xếp thành hàng 12, 15, 18 hàng đều thừa 5 hs
=> x‐5 thuộc BC ﴾12; 15; 18﴿ và 200<x‐5<400
BCNN ﴾12; 15; 18﴿
12= 222.3
15= 3.5
18= 2.322
BCNN (12; 15; 18) = 222.322.5 = 4.9.5 = 180
BC (12; 15; 18)= B(180) = {0;180;360;540;......}
mà 200<x‐5<400
nên x‐5=360
x= 360+5= 365
vậy số học sinh khối 6 đó là 365 hs
TL
Ta có :
BCNN (12,15,18)=180
Vậy số học sinh khi bớt đi 1 là một bội của 180, do đó bằng 180 k với k là một số tự nhiên.
Theo đề bài ta có
200<180 k<400
<=>1<k≤2
Vậy k=2 và số học sinh của trường khi bớt đi 1 là 180.2=360
Vậy số học sinh của trường đó là :
360+1=361 (học sinh)
Đs : 361 học sinh
HT
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Câu 2 đúng
Hk tốt
>.<k chắc lắm nhưng theo mik bt là câu 2 sẽ đúng
1) washes 2) is 3) don't have 4) Are - run 5) Are - get up 6) Does - go
7) Do - go 8) are 9) Are - watch 10) go 11) Start 12) have
1. wash 7. Do ... go
2. is 8. are
3. don't 9. watch
4. Do ... run 10. go
5. Do ... get up 11. start
6. Does ... go 12. have