Đề thi HK1 Toán 9 - Quận Cầu Giấy - Hà Nội - Năm 2...

A \(x > 0\)

B \(x > 1\)

C \(x > 0,x \ne 1\)

D \(x \ge 0,x \ne 1\)

A \( - 3\)

B 3

C \( - 1\)

D 5

A \(\frac{{\sqrt a }}{{16}}\).

B \(\frac{a}{4}\).

C \(\frac{a}{{16}}\).

D \(\frac{{\sqrt a }}{4}\).

A \(\sin C = \frac{{BC}}{{AC}}\)

B \(\cos C = \frac{{BC}}{{AC}}\)

C \(\tan C = \frac{{AB}}{{AC}}\)

D \(\cot C = \frac{{AB}}{{AC}}\)

A 0

B 1

C 2

D Vô số

A 4,8cm

B 2,4cm

C 1,2cm 

D 9,6cm

A \(\begin{array}{l}a)\,A = \frac{4}{9}\\b)\,\,P = \frac{{\sqrt x  + 2}}{{\sqrt x  + 5}}\\c)\,P\, > \,{P^2}\end{array}\)

B \(\begin{array}{l}a)\,A = 4\\b)\,\,P = \frac{{\sqrt x  + 2}}{{\sqrt x  + 5}}\\c)\,P\, > \,{P^2}\end{array}\)

C \(\begin{array}{l}a)\,A = \frac{4}{9}\\b)\,\,P = \frac{{\sqrt x  + 2}}{{\sqrt x  + 5}}\\c)\,P\, < \,{P^2}\end{array}\)

D \(\begin{array}{l}a)\,A = 9\\b)\,\,P = \frac{{\sqrt x  + 2}}{{\sqrt x  + 5}}\\c)\,P\, < \,{P^2}\end{array}\)

A \(1\)

B \( - 1\)

C \( \pm 1\)

D \(0\)

A \(\frac{{43}}{{12}}\)

B \(\frac{{49}}{{12}}\)

C \(\frac{{44}}{{13}}\)

D \(\frac{{43}}{6}\)