Đề thi HK1 Toán 9 - Nam Từ Liêm - Hà Nội - Năm 201...

A \( - 11\sqrt 3 \)

B \(11\sqrt 3 \)

C \(9\sqrt 3 \)

D \(2\sqrt 3 \)

A \(4\sqrt 5 \)

B \(2\)

C \( - \sqrt 5 \)

D \(2\sqrt 5 \)

A \(S = \left\{ {1;\,2} \right\}\)  

B \(S = \left\{ { - 2;\,2} \right\}\)

C \(S = \left\{ { - 1;\,1} \right\}\)

D \(S = \left\{ { - 1;\,3} \right\}\)

A \(x = 7\)

B \(x = 8\)

C \(x = 9\)

D \(x = 10\)

A \(B = \frac{{\sqrt x  + 1}}{{\sqrt x  - 1}}\)

B \(B = \frac{1}{{\sqrt x  + 1}}\)

C \(B = \frac{1}{{\sqrt x  - 1}}\)

D \(B = \frac{{\sqrt x  - 1}}{{\sqrt x  + 1}}\)

A \(0 \le x < 1\)

B \(0 < x < 1\)

C \(1 < x < 2\)

D \(1 \le x < 2\)

A \(\min \frac{1}{P} = 4\)

B \(\min \frac{1}{P} = 5\)

C \(\min \frac{1}{P} = 6\)

D \(\min \frac{1}{P} = 7\)

A \(\begin{array}{l}2.\,\,C\left( { - 2;\,1} \right)\\3.\,\,{S_{ABC}} = 10\,\left( {c{m^2}} \right)\end{array}\)

B \(\begin{array}{l}2.\,\,C\left( {2;\, - 1} \right)\\3.\,\,{S_{ABC}} = 5\,\,\left( {c{m^2}} \right)\end{array}\)

C \(\begin{array}{l}2.\,\,C\left( {2;\,1} \right)\\3.\,\,{S_{ABC}} = 10\,\,\left( {c{m^2}} \right)\end{array}\)

D \(\begin{array}{l}2.\,\,C\left( { - 2;\, - 1} \right)\\3.\,\,{S_{ABC}} = 5\,\,\left( {c{m^2}} \right)\end{array}\)

A \({M_{\max }} = \frac{3}{2}\,;\,\,\,\,{M_{\min }} = \frac{{ - 1}}{2}\)

B \({M_{\max }} = \frac{5}{2}\,;\,\,\,\,{M_{\min }} = \frac{1}{2}\)

C \({M_{\max }} = \frac{1}{2}\,;\,\,\,\,{M_{\min }} = \frac{{ - 1}}{2}\)

D \({M_{\max }} = 2\,;\,\,\,\,{M_{\min }} = \frac{1}{2}\)