Bài 9: Căn bậc ba
Hướng dẫn giải Bài 68 (Trang 36 SGK Toán 9, Tập 1)
<p>B&agrave;i 68 (trang 36, SGK To&aacute;n 9, Tập 1):</p> <p>T&iacute;nh</p> <p>a)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mn>27</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mrow><mo>-</mo><mn>8</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mn>125</mn><mn>3</mn></mroot></math>;</p> <p>b) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mroot><mn>135</mn><mn>3</mn></mroot><mroot><mn>5</mn><mn>3</mn></mroot></mfrac><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mn>54</mn><mn>3</mn></mroot><mo>.</mo><mroot><mn>4</mn><mn>3</mn></mroot></math>.</p> <p>&nbsp;</p> <p><strong><span style="text-decoration: underline;"><em>Hướng dẫn giải:</em></span></strong></p> <p>a)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mroot><mn>27</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mrow><mo>-</mo><mn>8</mn></mrow><mn>3</mn></mroot><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mn>125</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>3</mn><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mo>(</mo><mo>-</mo><mn>2</mn><mo>)</mo><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mn>5</mn><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>3</mn><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>2</mn><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mn>5</mn><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>0</mn><mo>.</mo></math></p> <p>b)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mroot><mn>135</mn><mn>3</mn></mroot><mroot><mn>5</mn><mn>3</mn></mroot></mfrac><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mn>54</mn><mn>3</mn></mroot><mo>.</mo><mroot><mn>4</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mroot><mfrac><mn>135</mn><mn>5</mn></mfrac><mn>3</mn></mroot><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mroot><mn>27</mn><mn>3</mn></mroot><mo>.</mo><mroot><mn>8</mn><mn>3</mn></mroot><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>3</mn><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><mn>3</mn><mo>.</mo><mn>2</mn><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mo>-</mo><mn>3</mn><mo>.</mo></math></p>
Hướng dẫn Giải Bài 68 (trang 36, SGK Toán 9, Tập 1)
GV: GV colearn
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Hướng dẫn Giải Bài 68 (trang 36, SGK Toán 9, Tập 1)
GV: GV colearn