Bài 1: Lũy thừa
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 4 (Trang 54 SGK Toán Giải Tích 12)</span>
<p><strong>Đề b&agrave;i</strong></p> <p>H&atilde;y nhắc lại c&aacute;c t&iacute;nh chất của lũy thừa với số mũ nguy&ecirc;n dương.</p> <p><strong>Lời giải chi tiết</strong></p> <p>Với&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><mo>,</mo><mi>n</mi><mo>&#8712;</mo><mi>N</mi><mo>*</mo></math> ta c&oacute; c&aacute;c t&iacute;nh chất sau đ&acirc;y:</p> <p>a. C&aacute;c t&iacute;nh chất về đẳng thức</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn><mo>.</mo><mo>&#160;</mo><msup><mi>a</mi><mi>m</mi></msup><mo>.</mo><msup><mi>a</mi><mi>n</mi></msup><mo>=</mo><msup><mi>a</mi><mrow><mi>m</mi><mo>+</mo><mi>n</mi></mrow></msup><mspace linebreak="newline"/><mn>2</mn><mo>.</mo><mo>&#160;</mo><msup><mi>a</mi><mi>m</mi></msup><mo>:</mo><msup><mi>a</mi><mi>n</mi></msup><mo>=</mo><msup><mi>a</mi><mrow><mi>m</mi><mo>-</mo><mi>n</mi></mrow></msup><mo>(</mo><mi>m</mi><mo>&#8805;</mo><mi>n</mi><mo>)</mo><mspace linebreak="newline"/><mn>3</mn><mo>.</mo><mo>&#160;</mo><msup><mfenced><msup><mi>a</mi><mi>m</mi></msup></mfenced><mi>n</mi></msup><mo>=</mo><msup><mi>a</mi><mrow><mi>m</mi><mo>.</mo><mi>n</mi></mrow></msup><mspace linebreak="newline"/><mn>4</mn><mo>.</mo><mo>&#160;</mo><msup><mfenced><mfrac><mi>a</mi><mi>b</mi></mfrac></mfenced><mi>m</mi></msup><mo>=</mo><mo>&#160;</mo><mfrac><msup><mi>a</mi><mi>m</mi></msup><msup><mi>b</mi><mi>m</mi></msup></mfrac><mo>(</mo><mi>b</mi><mo>&#8800;</mo><mn>0</mn><mo>)</mo><mspace linebreak="newline"/><mn>5</mn><mo>.</mo><mo>&#160;</mo><msup><mrow><mo>(</mo><mi>a</mi><mi>b</mi><mo>)</mo></mrow><mi>m</mi></msup><mo>=</mo><msup><mi>a</mi><mrow><mi>m</mi></mrow></msup><mo>.</mo><msup><mi>b</mi><mi>m</mi></msup></math></p> <p>b. C&aacute;c t&iacute;nh chất về bất đẳng thức</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>V</mi><mi>&#7899;</mi><mi>i</mi><mo>&#160;</mo><mi>a</mi><mo>&#62;</mo><mn>1</mn><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>&#236;</mi><mo>&#160;</mo><msup><mi>a</mi><mi>m</mi></msup><mo>&#62;</mo><msup><mi>a</mi><mi>n</mi></msup><mo>&#8660;</mo><mi>m</mi><mo>&#62;</mo><mi>n</mi><mspace linebreak="newline"/><mi>V</mi><mi>&#7899;</mi><mi>i</mi><mo>&#160;</mo><mn>0</mn><mo>&#60;</mo><mi>a</mi><mo>&#60;</mo><mn>1</mn><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>&#236;</mi><mo>&#160;</mo><msup><mi>a</mi><mi>m</mi></msup><mo>&#62;</mo><msup><mi>a</mi><mi>n</mi></msup><mo>&#8660;</mo><mi>m</mi><mo>&#60;</mo><mi>n</mi><mspace linebreak="newline"/><mi>V</mi><mi>&#7899;</mi><mi>i</mi><mo>&#160;</mo><mn>0</mn><mo>&#60;</mo><mi>a</mi><mo>&#60;</mo><mi>b</mi><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>&#236;</mi><mo>&#160;</mo><msup><mi>a</mi><mi>m</mi></msup><mo>&#62;</mo><msup><mi>b</mi><mi>m</mi></msup></math></p>
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