Bài 2. Quy tắc tính đạo hàm
Hướng dẫn giải Bài 4 (Trang 163 SGK Toán Đại số & Giải tích 11)
<p>T&igrave;m đạo h&agrave;m của c&aacute;c h&agrave;m số sau</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><msup><mi>x</mi><mn>2</mn></msup><mo>-</mo><mi>x</mi><msqrt><mi>x</mi></msqrt><mo>+</mo><mn>1</mn><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mi>b</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><msqrt><mn>2</mn><mo>-</mo><mn>5</mn><mi>x</mi><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt><mspace linebreak="newline"/><mi>c</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><mfrac><msup><mi>x</mi><mn>3</mn></msup><msqrt><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt></mfrac><mo>&#160;</mo><mo>(</mo><mo>&#160;</mo><mi>a</mi><mo>&#160;</mo><mi>l</mi><mi>&#224;</mi><mo>&#160;</mo><mi>h</mi><mi>&#7857;</mi><mi>n</mi><mi>g</mi><mo>&#160;</mo><mi>s</mi><mi>&#7889;</mi><mo>&#160;</mo><mo>)</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mi>d</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>=</mo><mfrac><mrow><mn>1</mn><mo>+</mo><mi>x</mi></mrow><msqrt><mn>1</mn><mo>-</mo><mi>x</mi></msqrt></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><mi>y</mi><mo>'</mo><mo>=</mo><mn>2</mn><mi>x</mi><mo>-</mo><mfrac><mn>3</mn><mn>2</mn></mfrac><msqrt><mi>x</mi></msqrt><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mspace linebreak="newline"/><mi>b</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>'</mo><mo>=</mo><mfrac><mrow><mo>-</mo><mn>5</mn><mo>-</mo><mn>2</mn><mi>x</mi></mrow><mrow><mn>2</mn><msqrt><mn>2</mn><mo>-</mo><mn>5</mn><mi>x</mi><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt></mrow></mfrac><mspace linebreak="newline"/><mi>c</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>'</mo><mo>=</mo><mfrac><mrow><mn>3</mn><msup><mi>x</mi><mn>2</mn></msup><msqrt><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt><mo>&#160;</mo><mo>-</mo><msup><mi>x</mi><mn>3</mn></msup><mfenced><msqrt><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt></mfenced></mrow><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>3</mn><msup><mi>x</mi><mn>2</mn></msup><msqrt><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt><mo>+</mo><msup><mi>x</mi><mn>3</mn></msup><mo>.</mo><mstyle displaystyle="true"><mfrac><mi>x</mi><msqrt><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></msqrt></mfrac></mstyle></mrow><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></mfrac><mspace linebreak="newline"/><mo>=</mo><mfrac><mrow><msup><mi>x</mi><mn>2</mn></msup><mfenced><mrow><mn>3</mn><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><mn>2</mn><mi>x</mi></mrow></mfenced></mrow><msqrt><msup><mfenced><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></mfenced><mn>3</mn></msup></msqrt></mfrac><mspace linebreak="newline"/><mi>d</mi><mo>,</mo><mo>&#160;</mo><mi>y</mi><mo>'</mo><mo>=</mo><mfrac><mrow><msqrt><mn>1</mn><mo>-</mo><mi>x</mi></msqrt><mo>-</mo><mfenced><mrow><mn>1</mn><mo>+</mo><mi>x</mi></mrow></mfenced><mo>.</mo><mstyle displaystyle="true"><mfrac><mfenced><mrow><mo>-</mo><mn>1</mn></mrow></mfenced><mrow><mn>2</mn><msqrt><mn>1</mn><mo>-</mo><mi>x</mi></msqrt></mrow></mfrac></mstyle></mrow><mrow><mn>1</mn><mo>-</mo><mi>x</mi></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>2</mn><mfenced><mrow><mn>1</mn><mo>-</mo><mi>x</mi></mrow></mfenced><mo>+</mo><mfenced><mrow><mn>1</mn><mo>+</mo><mi>x</mi></mrow></mfenced></mrow><mrow><mn>2</mn><msqrt><msup><mfenced><mrow><mn>1</mn><mo>-</mo><mi>x</mi></mrow></mfenced><mn>3</mn></msup></msqrt></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>3</mn><mo>-</mo><mi>x</mi></mrow><mrow><mn>2</mn><msqrt><msup><mfenced><mrow><mn>1</mn><mo>-</mo><mi>x</mi></mrow></mfenced><mn>3</mn></msup></msqrt></mrow></mfrac></math></p>
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