Question

1. Tìm số nguyên n biết 3 chia hết cho 2n-1

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Answer 1

\(3⋮2n-1\)

\(\Rightarrow2n-1\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)

bn tự lập bảng nha ! 

Answer 2

\(\Rightarrow2n-1\inƯ\left(3\right)\)

\(\Rightarrow2n-1\in\left\{1;-1;3;-3\right\}\)

\(\Rightarrow2n\in\left\{2;0;4;-4\right\}\)

\(\Rightarrow n\in\left\{1;0;2;-2\right\}\)

học tốt

Answer 3

\(3⋮2n-1\)

\(\Rightarrow2n-1\inƯ\left(3\right)\)

\(\Rightarrow2n-1\in\left\{\pm1;\pm3\right\}\)

Answer 4

  3 ⋮ 2n − 1

⇒2n − 1 ∈ Ư( 3) ={ ±1; ± 3 }

⇒2n ∈ {2;0;4; − 4} 

⇒n ∈ {1;0;2; − 2}

Vậy n ∈ {1;0;2; − 2}

Answer 5

                                               Bài giải

\(3⋮2n-1\)

\(\Rightarrow2n-1\inƯ\left(3\right)\)

\(\Rightarrow2n-1\in\hept{\pm1;\pm3}\)

Answer 6

\(3⋮2n-1\)

\(\Rightarrow2n-1\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)

\(\Rightarrow2n-1=1;-1;3;-3\)

\(\Rightarrow2n=2;0;4;-2\)

\(\Rightarrow n=1;0;2;-1\)

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