Toán Lớp 6: a) n-1 chia het cho 2n + 1
b) 2n+1 chia het cho 16n – 3n
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Toán Lớp 6: a) n-1 chia het cho 2n + 1
b) 2n+1 chia het cho 16n – 3n
Comments ( 1 )
$a,(n-1)\vdots(2n+1)\\ \Leftrightarrow (2n-2)\vdots(2n+1)\\ \Leftrightarrow [(2n+1)-3]\vdots(2n+1)\\ \text{Mà }(2n+1)\vdots(2n+1)\\ \Rightarrow 3\vdots(2n+1)\\ \Leftrightarrow 2n+1\in Ư(3)=[-3;-1;1;3]\\ \Leftrightarrow 2n\in[-4;-2;0;2]\\ \Leftrightarrow n\in[-2;-1;0;1]$
Câu b bạn xem lại đề nha