Hỏi gia sư
Gia sư 1-1
Chuyên đề
Trắc nghiệm
Tài liệu
Cửa hàng
Chọn lớp
Lớp 6
Lớp 7
Lớp 8
Lớp 9
Lớp 10
Lớp 11
Lớp 12
Đăng ký
Đăng nhập
Trang chủ
Hỏi gia sư
Gia sư 1-1
Chuyên đề
Trắc nghiệm
Tài liệu
Cửa hàng
Trang chủ
/
Giải bài tập
/ Lớp 12 / Toán học /
Bài 1: Lũy thừa
Bài 1: Lũy thừa
<span data-v-a7c68f28="">Hướng dẫn giải Bài 4 (Trang 56 SGK Toán Giải Tích 12)</span>
<p><strong>Bài 4 (Trang 56 SGK Toán Giải Tích 12):</strong></p> <p>Cho a, b là những số thực dương. Rút gọn các biểu thức sau:</p> <p>a) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>4</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mo>+</mo><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>4</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>3</mn><mn>4</mn></mfrac></mstyle></msup><mo>+</mo><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>4</mn></mfrac></mstyle></mrow></msup></mrow></mfenced></mrow></mfrac></math>;</p> <p>b) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>5</mn></mfrac></mstyle></msup><mfenced><mrow><mroot><msup><mi mathvariant="normal">b</mi><mn>4</mn></msup><mn>5</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mn>5</mn></mroot></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><mroot><mi mathvariant="normal">b</mi><mn>3</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mn>2</mn></mrow></msup><mn>3</mn></mroot></mrow></mfenced></mrow></mfrac></math>;</p> <p>c) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mo>-</mo><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup></mrow><mrow><mroot><msup><mi mathvariant="normal">a</mi><mn>2</mn></msup><mn>3</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mn>2</mn></msup><mn>3</mn></mroot></mrow></mfrac></math>;</p> <p>d) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msqrt><mi mathvariant="normal">b</mi></msqrt><mo>+</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msqrt><mi mathvariant="normal">a</mi></msqrt></mrow><mrow><mroot><mi mathvariant="normal">a</mi><mn>6</mn></mroot><mo>+</mo><mroot><mi mathvariant="normal">b</mi><mn>6</mn></mroot></mrow></mfrac></math>.</p> <p><strong><em>Hướng dẫn giải:</em></strong></p> <p>a) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>4</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mo>+</mo><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>4</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>3</mn><mn>4</mn></mfrac></mstyle></msup><mo>+</mo><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>4</mn></mfrac></mstyle></mrow></msup></mrow></mfenced></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><mi mathvariant="normal">a</mi><mo> </mo><mo>+</mo><mo> </mo><msup><mi mathvariant="normal">a</mi><mn>2</mn></msup></mrow><mrow><mi mathvariant="normal">a</mi><mo> </mo><mo>+</mo><mo> </mo><mn>1</mn></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><mi mathvariant="normal">a</mi><mo>(</mo><mi mathvariant="normal">a</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mrow><mi mathvariant="normal">a</mi><mo>+</mo><mn>1</mn></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mi mathvariant="normal">a</mi></math></p> <p>b) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>5</mn></mfrac></mstyle></msup><mfenced><mrow><mroot><msup><mi mathvariant="normal">b</mi><mn>4</mn></msup><mn>5</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mn>5</mn></mroot></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><mroot><mi mathvariant="normal">b</mi><mn>3</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mn>2</mn></mrow></msup><mn>3</mn></mroot></mrow></mfenced></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>5</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>4</mn><mn>5</mn></mfrac></mstyle></msup><mo>-</mo><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>5</mn></mfrac></mstyle></mrow></msup></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><mo>-</mo><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></mrow></msup></mrow></mfenced></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><mi mathvariant="normal">b</mi><mo>-</mo><mn>1</mn></mrow><mrow><mi mathvariant="normal">b</mi><mo>-</mo><mn>1</mn></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mn>1</mn></math></p> <p>c) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mo>-</mo><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup></mrow><mrow><mroot><msup><mi mathvariant="normal">a</mi><mn>2</mn></msup><mn>3</mn></mroot><mo>-</mo><mroot><msup><mi mathvariant="normal">b</mi><mn>2</mn></msup><mn>3</mn></mroot></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mo>.</mo><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></mrow></msup><mfenced><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup><mo>-</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup><mo>-</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>2</mn><mn>3</mn></mfrac></mstyle></msup></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><msup><mi mathvariant="normal">a</mi><mrow><mo>-</mo><mfrac><mn>1</mn><mn>3</mn></mfrac></mrow></msup><mo>.</mo><msup><mi mathvariant="normal">b</mi><mrow><mo>-</mo><mfrac><mn>1</mn><mn>3</mn></mfrac></mrow></msup><mo> </mo><mo>=</mo><mo> </mo><mfrac><mn>1</mn><mroot><mi>ab</mi><mn>3</mn></mroot></mfrac></math>;</p> <p>d) <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msqrt><mi mathvariant="normal">b</mi></msqrt><mo>+</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><msqrt><mi mathvariant="normal">a</mi></msqrt></mrow><mrow><mroot><mi mathvariant="normal">a</mi><mn>6</mn></mroot><mo>+</mo><mroot><mi mathvariant="normal">b</mi><mn>6</mn></mroot></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><mo>.</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>2</mn></mfrac></mstyle></msup><mo>+</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><mo>.</mo><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>2</mn></mfrac></mstyle></msup></mrow><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>6</mn></mfrac></mstyle></msup><mo>+</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>6</mn></mfrac></mstyle></msup></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mrow><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><mo>.</mo><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>3</mn></mfrac></mstyle></msup><mfenced><mrow><msup><mi mathvariant="normal">b</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>6</mn></mfrac></mstyle></msup><mo>+</mo><msup><mi mathvariant="normal">a</mi><mstyle displaystyle="true"><mfrac><mn>1</mn><mn>6</mn></mfrac></mstyle></msup></mrow></mfenced></mrow><mrow><msup><mi mathvariant="normal">a</mi><mfrac><mn>1</mn><mn>6</mn></mfrac></msup><mo>+</mo><msup><mi mathvariant="normal">b</mi><mfrac><mn>1</mn><mn>6</mn></mfrac></msup></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><msup><mi mathvariant="normal">a</mi><mfrac><mn>1</mn><mn>3</mn></mfrac></msup><mo>.</mo><msup><mi mathvariant="normal">b</mi><mfrac><mn>1</mn><mn>3</mn></mfrac></msup><mo> </mo><mo>=</mo><mo> </mo><mroot><mi>ab</mi><mn>3</mn></mroot></math></p>
Hướng dẫn Giải Bài 4 (Trang 56, SGK Toán Giải Tích 12)
GV:
GV colearn
Xem lời giải bài tập khác cùng bài
Lý thuyết Lũy thừa
Xem lời giải
<div data-v-a7c68f28=""><span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 1 (Trang 49 SGK Toán Giải Tích 12)</span></div>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 2 (Trang 50 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 3 (Trang 52 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 4 (Trang 54 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 5 (Trang 55 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Hoạt động 6 (Trang 55 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Bài 1 (Trang 55 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Bài 2 (Trang 55 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Bài 3 (Trang 56 SGK Toán Giải Tích 12)</span>
Xem lời giải
<span data-v-a7c68f28="">Hướng dẫn giải Bài 5 (Trang 56 SGK Toán Giải Tích 12)</span>
Xem lời giải
Video hướng dẫn giải bài tập
Hướng dẫn Giải Bài 4 (Trang 56, SGK Toán Giải Tích 12)
GV:
GV colearn