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0
2024-01-02 22:54:10
Gọi a là số học sinh khối 6 của trường đó ( a ϵ N* , 300 < a < 400 )
theo bài ra , a chia 12 , 15 , 18 đều dư 9 em hs
⇒ a- 9 ∈ BC ( 12 , 15 , 18 )
12 = 22 . 3 15 = 3 . 5
18 =2 . 32
⇒ BCNN ( 12 , 15 , 18 ) = 22 . 32 . 5 = 180
⇒ BC ( 12 , 15 ,18 ) = {0 ; 180 ; 360 ; 540 ;....}
mà 300 < a < 400
⇒ a = 360
Vậy trường đó có 360 học sinh khối 6
Chuc ban hoc tot nhaa !
2024-01-02 22:35:38
D . gieo vần chân hoặc vần lưng
Chuc cau hoc tot nhaa !