Bài 2. Quy tắc tính đạo hàm
Lý thuyết Quy tắc tính đạo hàm
<p><strong>1. C&ocirc;ng thức</strong></p> <p>&nbsp; <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mi>c</mi></mfenced><mo>'</mo><mo>=</mo><mn>0</mn></math> ( <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi></math>&nbsp;l&agrave; hằng số);</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><msup><mi>x</mi><mi>n</mi></msup></mfenced><mo>'</mo><mo>=</mo><mi>n</mi><msup><mi>x</mi><mrow><mi>n</mi><mo>-</mo><mn>1</mn></mrow></msup><mfenced><mrow><mi>n</mi><mo>&#8712;</mo><mi mathvariant="normal">&#8469;</mi><mo>*</mo><mo>,</mo><mo>&#160;</mo><mi>x</mi><mo>&#8712;</mo><mi mathvariant="normal">&#8477;</mi></mrow></mfenced></math>&nbsp;;</p> <p>&nbsp; <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><msqrt><mi>x</mi></msqrt></mfenced><mo>'</mo><mo>=</mo><mfrac><mn>1</mn><mrow><mn>2</mn><msqrt><mi>x</mi></msqrt></mrow></mfrac><mfenced><mrow><mi>x</mi><mo>&#62;</mo><mn>0</mn></mrow></mfenced></math>.</p> <p><strong>2. Ph&eacute;p to&aacute;n</strong></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mi>u</mi><mo>+</mo><mi>v</mi></mrow></mfenced><mo>'</mo><mo>=</mo><mi>u</mi><mo>'</mo><mo>+</mo><mi>v</mi><mo>'</mo><mo>;</mo><mspace linebreak="newline"/><mfenced><mrow><mi>u</mi><mo>-</mo><mi>v</mi></mrow></mfenced><mo>'</mo><mo>=</mo><mi>u</mi><mo>'</mo><mo>-</mo><mi>v</mi><mo>'</mo><mo>;</mo><mspace linebreak="newline"/><mfenced><mrow><mi>u</mi><mi>v</mi></mrow></mfenced><mo>'</mo><mo>=</mo><mi>u</mi><mo>'</mo><mi>v</mi><mo>+</mo><mi>u</mi><mi>v</mi><mo>'</mo><mo>;</mo></math></p> <p>&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mi>k</mi><mi>u</mi></mrow></mfenced><mo>'</mo><mo>=</mo><mi>k</mi><mi>u</mi><mo>'</mo></math>(<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>k</mi></math>&nbsp;l&agrave; hằng số);</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mfrac><mi>u</mi><mi>v</mi></mfrac></mfenced><mo>'</mo><mo>=</mo><mfrac><mrow><mi>u</mi><mo>'</mo><mi>v</mi><mo>-</mo><mi>u</mi><mi>v</mi><mo>'</mo></mrow><msup><mi>v</mi><mn>2</mn></msup></mfrac><mo>&#160;</mo><mfenced><mrow><mi>v</mi><mo>=</mo><mi>v</mi><mfenced><mi>x</mi></mfenced><mo>&#8800;</mo><mn>0</mn></mrow></mfenced><mo>;</mo><mspace linebreak="newline"/><mfenced><mfrac><mn>1</mn><mi>v</mi></mfrac></mfenced><mo>'</mo><mo>=</mo><mfrac><mrow><mo>-</mo><mi>v</mi><mo>'</mo></mrow><msup><mi>v</mi><mn>2</mn></msup></mfrac><mo>&#160;</mo><mfenced><mrow><mi>v</mi><mo>=</mo><mi>v</mi><mfenced><mi>x</mi></mfenced><mo>&#8800;</mo><mn>0</mn></mrow></mfenced><mo>.</mo></math></p> <p><strong>3. Đạo h&agrave;m của h&agrave;m hợp</strong></p> <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>y</mi><msub><mo>'</mo><mi>x</mi></msub><mo>=</mo><mi>y</mi><msub><mo>'</mo><mi>u</mi></msub><mo>.</mo><mi>u</mi><msub><mo>'</mo><mi>x</mi></msub></math></p> <p>Hệ quả: +) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><msup><mi>u</mi><mi>n</mi></msup></mfenced><mo>'</mo><mo>=</mo><mi>n</mi><mo>.</mo><msup><mi>u</mi><mrow><mi>n</mi><mo>-</mo><mn>1</mn></mrow></msup><mo>.</mo><mi>u</mi><mo>'</mo></math>&nbsp;;&nbsp;</p> <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><msqrt><mi>u</mi></msqrt></mfenced><mo>'</mo><mo>=</mo><mfrac><mrow><mi>u</mi><mo>'</mo></mrow><mrow><mn>2</mn><msqrt><mi>u</mi></msqrt></mrow></mfrac></math>.</p>
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