Question

Bài 1: Viết các tập hợp sau

a) Ư(16) ;  Ư(24) ; ƯC(16,24)

b) B(12)  ;  B(18)  ; BC(12,18)

Giúp vs cảm ơn trước

Answer 1

\(a,Ư\left(16\right)=\left\{1;2;4;8;16\right\}\\ Ư\left(24\right)=\left\{1;2;3;4;6;8;12;24\right\}\)

ta có 

\(16=2^4\\ 24=2^3.3\)

\(\rightarrowƯCLN\left(16,24\right)=2^3=8\\ \rightarrowƯC\left(16,24\right)=Ư\left(8\right)=\left\{1;2;4;8\right\}\)

\(b,B\left(12\right)=\left\{0;12;24;...\right\}\\ B\left(18\right)=\left\{0;18;36;...\right\}\)

ta có 

\(12=2^2.3\\ 18=2.3^2\)

\(\rightarrow BCNN\left(12,18\right)=2^2.3^2=36\\ \rightarrow BC\left(12,18\right)=B\left(36\right)=\left\{0;36;72;...\right\}\)