Bài 1. Định nghĩa và ý nghĩa của đạo hàm
Hướng dẫn giải Bài 2 (Trang 156 SGK Toán Đại số & Giải tích 11)
<p>T&iacute;nh<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#9651;</mo><mi>y</mi></math> v&agrave;&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mo>&#9651;</mo><mi>y</mi></mrow><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfrac></math> của c&aacute;c h&agrave;m số sau theo x v&agrave;<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#9651;</mo><mi>x</mi></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>5</mn><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mi>b</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><msup><mi>x</mi><mn>2</mn></msup><mo>-</mo><mn>1</mn><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mi>c</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><mn>2</mn><msup><mi>x</mi><mn>3</mn></msup><mo>&#160;</mo><mo>&#160;</mo><mo>;</mo><mo>&#160;</mo><mi>d</mi><mo>,</mo><mi>y</mi><mo>=</mo><mfrac><mn>1</mn><mi>x</mi></mfrac><mspace linebreak="newline"/><mi>G</mi><mi>i</mi><mi>&#7843;</mi><mi>i</mi><mo>&#160;</mo><mspace linebreak="newline"/><mi>a</mi><mo>,</mo><mo>&#160;</mo><mo>&#9651;</mo><mi>y</mi><mo>=</mo><mi>f</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>-</mo><mi>f</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>2</mn><mfenced><mrow><mn>2</mn><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>-</mo><mn>5</mn><mo>-</mo><mfenced><mrow><mn>2</mn><mi>x</mi><mo>-</mo><mn>5</mn></mrow></mfenced><mo>=</mo><mn>2</mn><mo>&#9651;</mo><mi>x</mi><mspace linebreak="newline"/><mo>&#8658;</mo><mfrac><mrow><mo>&#9651;</mo><mi>y</mi></mrow><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfrac><mo>=</mo><mn>2</mn><mspace linebreak="newline"/><mi>b</mi><mo>,</mo><mo>&#160;</mo><mo>&#9651;</mo><mi>y</mi><mo>=</mo><mi>f</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>-</mo><mi>f</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><msup><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mn>2</mn></msup><mo>-</mo><mn>1</mn><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>1</mn><mspace linebreak="newline"/><mo>=</mo><mo>&#9651;</mo><mi>x</mi><mfenced><mrow><mn>2</mn><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>&#8658;</mo><mfrac><mrow><mo>&#9651;</mo><mi>y</mi></mrow><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfrac><mo>=</mo><mn>2</mn><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi><mspace linebreak="newline"/><mi>c</mi><mo>,</mo><mo>&#160;</mo><mo>&#9651;</mo><mi>y</mi><mo>=</mo><mi>f</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>-</mo><mi>f</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>2</mn><mfenced><mrow><mn>2</mn><mo>+</mo><mo>&#9651;</mo><msup><mi>x</mi><mn>3</mn></msup></mrow></mfenced><mo>-</mo><mn>2</mn><msup><mi>x</mi><mn>3</mn></msup><mspace linebreak="newline"/><mo>=</mo><mn>2</mn><mo>&#9651;</mo><mi>x</mi><mfenced open="[" close="]"><mrow><mn>3</mn><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>3</mn><mi>x</mi><mo>&#9651;</mo><mi>x</mi><mo>+</mo><msup><mfenced><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mn>2</mn></msup></mrow></mfenced><mspace linebreak="newline"/><mo>&#8658;</mo><mfrac><mrow><mo>&#9651;</mo><mi>y</mi></mrow><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfrac><mo>=</mo><mn>2</mn><mfenced open="[" close="]"><mrow><mn>3</mn><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>3</mn><mi>x</mi><mo>&#9651;</mo><mi>x</mi><mo>+</mo><msup><mfenced><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mn>2</mn></msup></mrow></mfenced><mspace linebreak="newline"/><mi>d</mi><mo>,</mo><mo>&#160;</mo><mo>&#9651;</mo><mi>y</mi><mo>=</mo><mi>f</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced><mo>-</mo><mi>f</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mfrac><mn>1</mn><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfrac><mo>-</mo><mfrac><mn>1</mn><mi>x</mi></mfrac><mo>=</mo><mfrac><mrow><mo>-</mo><mo>&#9651;</mo><mi>x</mi></mrow><mrow><mi>x</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced></mrow></mfrac><mspace linebreak="newline"/><mo>&#8658;</mo><mfrac><mrow><mo>&#9651;</mo><mi>y</mi></mrow><mrow><mo>&#9651;</mo><mi>x</mi></mrow></mfrac><mo>=</mo><mfrac><mrow><mo>-</mo><mn>1</mn></mrow><mrow><mi>x</mi><mfenced><mrow><mi>x</mi><mo>+</mo><mo>&#9651;</mo><mi>x</mi></mrow></mfenced></mrow></mfrac></math></p>
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