a: \(Ư\left(16\right)=\left\{1;2;4;8;16\right\}\)

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

\(ƯC\left(16;24\right)=\left\{1;2;4;8\right\}\)

b: \(Ư\left(20\right)=\left\{1;2;4;5;10;20\right\}\)

\(Ư\left(32\right)=\left\{1;2;4;8;16;32\right\}\)

\(ƯC\left(20;32\right)=\left\{1;2;4\right\}\)

1)

\(Ư\left(6\right)=\left\{\pm1;\pm2;\pm3;\pm6\right\}\)

\(Ư\left(14\right)=\left\{\pm1;\pm2;\pm7;\pm14\right\}\)

\(Ư\left(17\right)=\left\{\pm1;\pm17\right\}\)

\(Ư\left(1\right)=\left\{\pm1\right\}\)

2)

a)

\(Ư\left(12\right)=\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\right\}\)

b)

\(Ư\left(18\right)=\left\{\pm1;\pm2;\pm3;\pm6;\pm9;\pm18\right\}\)

c)

\(Ư\left(24\right)=\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm8;\pm12;\pm24\right\}\)

\(\text{Ta có:}\)\(x>8\)\(\Rightarrow\)\(x\in\left\{12;24\right\}\)

TL

12 và 24 nha

Hok tốt

Bài 31 : \(A=\left\{1;2;3;....;20\right\}\)

\(U\left(5\right)=\left\{1;5\right\}\)

\(U\left(6\right)=\left\{1;2;3;6\right\}\)

\(U\left(10\right)=\left\{1;2;5;10\right\}\)

\(U\left(2\right)=\left\{1;2\right\}\)

\(B\left(5\right)=\left\{5;10;15;20\right\}\)

\(B\left(6\right)=\left\{6;12;18\right\}\)

\(B\left(10\right)=\left\{10;20\right\}\)

\(B\left(12\right)=\left\{12\right\}\)

\(B\left(20\right)=\left\{20\right\}\)

\(\Rightarrow B\in\left\{U\left(2\right);U\left(5\right);U\left(6\right);U\left(10\right);B\left(5\right);B\left(10\right);B\left(12\right);B\left(20\right)\right\}=\left\{1;2;3;5;6;10;12;15;18;20\right\}\)

Bài 33 :

\(U\left(250\right)=\left\{1;2;5;10;25;50;125;250\right\}\)

\(B\left(11\right)=\left\{11;22;33;44;55;66;77;88;99;110;...\right\}\)

Tập hợp tất cả các số có 2 chữ số thuộc về U(250) là 

\(\left\{10;25;50\right\}\)

Tập hợp tất cả các số có 2 chữ số thuộc về B(11) là 

\(\left\{11;22;33;44;55;66;77;88;99\right\}\)

Bài 32 :

Tập hợp các số thuộc về B(3);B(5) là :

\(\left\{125;126;201;205;220;312;345;501;595;630;1780\right\}\)

B(4) = {0; 4; 8; 12; 16;…}

B(7) = {0; 7; 14; 21;…}

\(a,B\left(4\right)=\left\{0;4;8;12;16;...\right\}\\ b,B\left(7\right)=\left\{0;7;14;21;28;...\right\}\)

a) B(4)={0;4;8;12;16;20;24;28;32;...}
b) B(7)={0;7;14;21;28;35;42;49;...}

B(4) = {0; 4; 8; 12; 16;…}

B(7) = {0; 7; 14; 21;…}

Bài 2: 

a: M={0;1;2;3;4;5;6;7;8}

b: C={0;1;2;3;4;5;6;7}

\(A=\left\{-2;0;2;4;8\right\}\\ B=\left\{-2;-1;0;1;2\right\}\\ \left(x^2-2x-3\right)\left(x^2-3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\\x=\sqrt{3}\\x=-\sqrt{3}\end{matrix}\right.\Leftrightarrow C=\left\{-\sqrt{3};-1;\sqrt{3};3\right\}\)

\(a,A\cap\left(B\cap C\right)=A\cap\left\{-1\right\}=\varnothing\\ b,A\cup\left(B\cap C\right)=A\cup\left\{-1\right\}=\left\{-2;-1;0;2;4;8\right\}\\ c,câu.a.làm.r\\ d,A\backslash\left(B\cap C\right)=A\backslash\left\{-1\right\}=\left\{-2;0;2;4;8\right\}\\ e,A\backslash\left(B\C\right)=A\backslash\left\{-2;0;1;2\right\}=\left\{4;8\right\}\)

a)\(Ư\left(8\right)=\left\{0;8;16;24;...\right\}\)

\(Ư\left(12\right)=\left\{0;12;24;36;48;...\right\}\)

\(Ư\left(15\right)=\left\{0;15;30;45;60;...\right\}\)

b)\(B=\left\{0;7;14;21;28;35;42;49\right\}\)

c)\(C=\left\{0;3;6;9;12;...;30;33\right\}\)

Tập hợp C có số phần tử là

\(\left(33-0\right)\div3+1=12\)(phần tử)

@ditmecacban này

nói bậy vừa thôi đi

báo cáo lun o((>ω< ))o

a) Ư(8) = { 1 ; 2 ; 4 ; 8 }

Ư(12) = { 1 ; 2 ; 3 ; 4 ; 6 ; 12 }

Ư(15) = { 1 ; 3 ; 5 ; 15 }

a, Ư(8)={1;2;4;8}

     Ư(12)={1;2;3;4;6;12}

    Ư(15)={1;3;5;15}

Mik chỉ điền nguyên dương,nếu bn hok số âm r thì bổ sung nha

Còn chx hok thì lm như trên là ok r

b) Ta có :

B(7) = { 0 ; 7 ; 14 ; ... } mà bài yêu cầu tìm B(7) Không lớn hơn 50

=> Ta có tập hợp sau :

{ 0 ; 7 ; 14 ; 21 ; 28 ; 35 ; 42 ; 49 }