Bài 9: Căn bậc ba
Hướng dẫn giải Bài 67 (Trang 36 SGK Toán 9, Tập 1)
<p><strong>B&agrave;i 67 (trang 36, SGK To&aacute;n 9, Tập 1):</strong></p> <p>H&atilde;y t&igrave;m</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mn>512</mn><mn>3</mn></mroot><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mroot><mrow><mo>-</mo><mn>729</mn></mrow><mn>3</mn></mroot><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mroot><mrow><mn>0</mn><mo>,</mo><mn>064</mn></mrow><mn>3</mn></mroot><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mroot><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>216</mn></mrow><mn>3</mn></mroot><mo>;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mroot><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>008</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>.</mo></math></p> <p>&nbsp;</p> <p><strong><span style="text-decoration: underline;"><em>Hướng dẫn giải:</em></span></strong></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mn>512</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><msup><mn>8</mn><mn>3</mn></msup><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>8</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mrow><mo>-</mo><mn>729</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><mrow><msup><mrow><mo>(</mo><mo>-</mo><mn>9</mn><mo>)</mo></mrow><mn>3</mn></msup><mo>&#160;</mo></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>-</mo><mn>9</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mrow><mn>0</mn><mo>,</mo><mn>064</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><mrow><mn>0</mn><mo>,</mo><msup><mn>4</mn><mn>3</mn></msup><mo>&#160;</mo></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mn>0</mn><mo>,</mo><mn>4</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>216</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><mrow><msup><mrow><mo>(</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>6</mn><mo>)</mo></mrow><mn>3</mn></msup><mo>&#160;</mo></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>6</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>008</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><msup><mrow><mo>(</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>2</mn><mo>)</mo></mrow><mn>3</mn></msup><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>2</mn><mo>.</mo></math></p>
Hướng dẫn Giải Bài 67 (trang 36, SGK Toán 9, Tập 1)
GV: GV colearn
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Hướng dẫn Giải Bài 67 (trang 36, SGK Toán 9, Tập 1)
GV: GV colearn