Bài 3. Các phép toán tập hợp
Hướng dẫn Giải bài 1 (Trang 15, SGK Toán 10, Tập 1)
<p><strong>C&acirc;u hỏi:</strong> K&iacute; hiệu A l&agrave; tập hợp c&aacute;c chữ c&aacute;i trong c&acirc;u "C&Oacute; CH&Iacute; TH&Igrave; N&Ecirc;N", B&nbsp;l&agrave; tập hợp c&aacute;c chữ c&aacute;i trong c&acirc;u "C&Oacute; C&Ocirc;NG M&Agrave;I SẮT C&Oacute; NG&Agrave;Y N&Ecirc;N KIM".</p> <p>H&atilde;y x&aacute;c định&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>A</mi><mo>&#8745;</mo><mi>B</mi><mo>,</mo><mo>&#160;</mo><mi>A</mi><mo>&#8746;</mo><mi>B</mi><mo>,</mo><mo>&#160;</mo><mi>A</mi><mo>&#160;</mo><mo>\</mo><mo>&#160;</mo><mi>B</mi><mo>,</mo><mo>&#160;</mo><mi>B</mi><mo>&#160;</mo><mo>\</mo><mo>&#160;</mo><mi>A</mi></math></p> <p><strong>Lời giải:</strong></p> <p>Ta c&oacute;:</p> <p>A = {C, O, H, I, T, N, &Ecirc;}</p> <p>B = {C, O, N, G, &Ocirc;, M, A, Ă, I, S, T, Y, &Ecirc;, K)</p> <p>Vậy n&ecirc;n:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>A</mi><mo>&#8745;</mo><mi>B</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>{</mo><mi>C</mi><mo>,</mo><mo>&#160;</mo><mi>O</mi><mo>,</mo><mo>&#160;</mo><mi>I</mi><mo>,</mo><mo>&#160;</mo><mi>T</mi><mo>,</mo><mo>&#160;</mo><mi>N</mi><mo>,</mo><mo>&#160;</mo><mi>&#202;</mi><mo>}</mo><mspace linebreak="newline"/><mi>A</mi><mo>&#8746;</mo><mi>B</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>{</mo><mi>C</mi><mo>,</mo><mo>&#160;</mo><mi>O</mi><mo>,</mo><mo>&#160;</mo><mi>&#212;</mi><mo>,</mo><mo>&#160;</mo><mi>N</mi><mo>,</mo><mo>&#160;</mo><mi>G</mi><mo>,</mo><mo>&#160;</mo><mi>M</mi><mo>,</mo><mo>&#160;</mo><mi>A</mi><mo>,</mo><mo>&#160;</mo><mi>&#258;</mi><mo>,</mo><mo>&#160;</mo><mi>I</mi><mo>,</mo><mo>&#160;</mo><mi>S</mi><mo>,</mo><mo>&#160;</mo><mi>T</mi><mo>,</mo><mo>&#160;</mo><mi>Y</mi><mo>,</mo><mo>&#160;</mo><mi>&#202;</mi><mo>,</mo><mo>&#160;</mo><mi>K</mi><mo>,</mo><mo>&#160;</mo><mi>H</mi><mo>}</mo><mspace linebreak="newline"/><mi>A</mi><mo>&#160;</mo><mo>\</mo><mo>&#160;</mo><mi>B</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>{</mo><mi>H</mi><mo>}</mo><mspace linebreak="newline"/><mi>B</mi><mo>&#160;</mo><mo>\</mo><mo>&#160;</mo><mi>A</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>{</mo><mi>G</mi><mo>,</mo><mo>&#160;</mo><mi>S</mi><mo>,</mo><mo>&#160;</mo><mi>K</mi><mo>,</mo><mo>&#160;</mo><mi>M</mi><mo>,</mo><mo>&#160;</mo><mi>A</mi><mo>,</mo><mo>&#160;</mo><mi>&#212;</mi><mo>,</mo><mo>&#160;</mo><mi>&#258;</mi><mo>,</mo><mo>&#160;</mo><mi>Y</mi><mo>}</mo></math></p>
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