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A \(\frac{{AB}}{{CD}} = \frac{1}{4}\)

B \(\frac{{AB}}{{CD}} = \frac{1}{5}\)

C \(\frac{{AB}}{{CD}} = \frac{1}{6}\)

D \(\frac{{AB}}{{CD}} = \frac{1}{7}\)

A Chỉ có (I) đúng.

B Chỉ có (II) đúng.

C Cả (I) và (II) đúng.     

D Cả (I) và (II) sai.

A x = 6,5

B x = 7,5

C x = 5

D x = 8

A \(\frac{{AM}}{{AB}} = \frac{2}{5}\)

B \(\frac{{AM}}{{AB}} = \frac{5}{2}\)

C \(\frac{{AM}}{{AB}} = \frac{2}{9}\)

D \(\frac{{AM}}{{AB}} = \frac{9}{2}\)

A \(x = 2\sqrt 5 ,\;y = 10\)

B \(x = 10\sqrt 5 ,\;y = 9\)

C \(x = 6\sqrt 5 ,\;y = 10\)

D \(x = 5\sqrt 5 ,\;y = 10\)

A \(3\;c{m^2}\)

B \(5\;c{m^2}\)

C \(4\;c{m^2}\)

D \(6\;c{m^2}\)

A \(\begin{array}{l}a)\,x = \frac{{24}}{5}\\b)\,x = \frac{{21}}{5}\end{array}\)

B \(\begin{array}{l}a)\,x = \frac{{23}}{5}\\b)\,x = \frac{{22}}{5}\end{array}\)

C \(\begin{array}{l}a)\,x = \frac{{21}}{5}\\b)\,x = \frac{{24}}{5}\end{array}\)

D \(\begin{array}{l}a)\,x = \frac{ - {24}}{5}\\b)\,x = \frac{{21}}{5}\end{array}\)