Đề thi HK2 Toán 9 - Quận Hoàn Kiếm - Hà Nội - Năm...

A \(\frac{4}{5}\)

B \(\frac{5}{4}\)

C \(5\)

D \(\frac{5}{2}\)

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

B \(B = \frac{{\sqrt x }}{{2\sqrt x  + 1}}\)

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

D \(B = \frac{{\sqrt x  - 1}}{{2\sqrt x  + 1}}\)

A \(0\)

B \(1\)

C \(2\)

D \(3\)

A \(750\)

B \(800\)

C \(850\)

D \(700\)

A \(\left( {x;y} \right) = \left( {2;5} \right).\)

B \(\left( {x;y} \right) = \left( {5;2} \right).\)

C \(\left( {x;y} \right) = \left( {2; - 5} \right).\)

D \(\left( {x;y} \right) = \left( {5; - 2} \right).\)

A \(\begin{array}{l}a)\,\,m > 0\\b)\,\,m = \frac{3}{2}\end{array}\)

B \(\begin{array}{l}a)\,\,m \ne 1\\b)\,\,m =  \pm \frac{1}{2}\end{array}\)

C \(\begin{array}{l}a)\,\,m \ne 0\\b)\,\,m =  \pm \frac{1}{2}\end{array}\)

D \(\begin{array}{l}a)\,\,m \ne 0\\b)\,\,m =  \pm \frac{3}{2}\end{array}\)

A \(\frac{{33}}{2}\)

B \(\frac{{33}}{4}\)

C \(\frac{{33}}{8}\)

D \(33\)