Bài 1: Lũy thừa
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 5 (Trang 55 SGK Toán Giải Tích 12)</span>
<p><strong>Đề b&agrave;i</strong></p> <p>R&uacute;t gọn biểu thức:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><msup><mfenced><msup><mi>a</mi><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></msup></mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></msup><mrow><msup><mi>a</mi><mrow><msqrt><mn>5</mn></msqrt><mo>-</mo><mn>3</mn></mrow></msup><mo>.</mo><msup><mi>a</mi><mrow><mn>4</mn><mo>-</mo><msqrt><mn>5</mn></msqrt></mrow></msup></mrow></mfrac></math></p> <p><strong> Lời giải chi tiết</strong></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><msup><mfenced><msup><mi>a</mi><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></msup></mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></msup><mrow><msup><mi>a</mi><mrow><msqrt><mn>5</mn></msqrt><mo>-</mo><mn>3</mn></mrow></msup><mo>.</mo><msup><mi>a</mi><mrow><mn>4</mn><mo>-</mo><msqrt><mn>5</mn></msqrt></mrow></msup></mrow></mfrac><mo>=</mo><mfrac><msup><mi>a</mi><mrow><mo>(</mo><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn><mo>)</mo><mo>(</mo><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn><mo>)</mo></mrow></msup><msup><mi>a</mi><mrow><mfenced><mrow><msqrt><mn>5</mn></msqrt><mo>-</mo><mn>3</mn></mrow></mfenced><mo>+</mo><mfenced><mrow><mn>4</mn><mo>-</mo><msqrt><mn>5</mn></msqrt></mrow></mfenced></mrow></msup></mfrac><mo>=</mo><mfrac><msup><mi>a</mi><mrow><mn>3</mn><mo>-</mo><mn>1</mn></mrow></msup><msup><mi>a</mi><mn>1</mn></msup></mfrac><mo>=</mo><mfrac><msup><mi>a</mi><mn>2</mn></msup><mi>a</mi></mfrac><mo>=</mo><mi>a</mi></math></p>
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