Đề thi HK1 Toán 8 - Sở GD&ĐT Nam Định - Năm 2017 -...

A \({a^3} - 8\)

B \({\left( {a - 2} \right)^3}\)

C \({a^3} + 8\)

D \({\left( {a + 2} \right)^3}\)

A \( - 2017x\)

B \(2017x\)

C \( - 2017xy\)

D \(2017xy\)

A \(\left( {x + 2} \right)\left( {x + 3} \right)\)

B \(\left( {x - 2} \right)\left( {x + 3} \right)\)

C \(\left( {x - 2} \right)\left( {x - 3} \right)\)

D \(\left( {x + 2} \right)\left( {x - 3} \right)\)

A \(\left\{ {0;\, - 1} \right\}\)

B \(\emptyset \)

C \(\left\{ 0 \right\}\)

D \(\left\{ {0; \pm 1} \right\}\)

A \(2\,c{m^2}\)

B \(10\,c{m^2}\)

C \(12\,c{m^2}\)

D \(24\,c{m^2}\)

A \(6\)

B \(4\)

C \(2\)

D \(1\)

A \(16\,cm\)

B \(12\,cm\)

C \(8\,cm\)

D \(4cm\)

A Hai đường chéo bằng nhau và vuông góc với nhau

B Bốn cạnh bằng nhau

C Bốn cạnh bằng nhau và có một góc vuông

D Bốn góc vuông

A \(\begin{array}{l}a)\,\,2{x^2}\left( {1 - 2x} \right)\\b)\,\,\left( {x - 2} \right)\left( {3x - 4} \right)\\c)\,\,\left( {x + y - 3z} \right)\left( {x + y + 3z} \right)\end{array}\)

B \(\begin{array}{l}a)\,\,2x\left( {1 - 2x} \right)\\b)\,\,\left( {x - 2} \right)\left( {3x - 4} \right)\\c)\,\,\left( {x - y - 3z} \right)\left( {x - y + 3z} \right)\end{array}\)

C \(\begin{array}{l}a)\,\,2x\left( {1 - x} \right)\\b)\,\,\left( {x - 2} \right)\left( {3x + 4} \right)\\c)\,\,\left( {x + y - 3z} \right)\left( {x + y + 3z} \right)\end{array}\)

D \(\begin{array}{l}a)\,\,2x\left( {1 - 2x} \right)\\b)\,\,\left( {x + 2} \right)\left( {3x + 4} \right)\\c)\,\,\left( {x - y - 3z} \right)\left( {x - y + 3z} \right)\end{array}\)

A \(a)\,\,m = 20\)

B \(a)\,\,m = 30\)

C \(a)\,\,m = 10\)

D \(a)\,\,m = 0\)

A \(\begin{array}{l}a)\,\,A = \frac{3}{{2 - x}}\\b)\,\,B = x - y\end{array}\)        

B \(\begin{array}{l}a)\,\,A = \frac{{ - 3}}{{2 - x}}\\b)\,\,B = x + y\end{array}\)

C \(\begin{array}{l}a)\,\,A = \frac{3}{{2 + x}}\\b)\,\,B = x + 2y\end{array}\)

D \(\begin{array}{l}a)\,\,A = \frac{3}{{x - 2}}\\b)\,\,B = 2x - y\end{array}\)