40 câu trắc nghiệm Ôn tập Chương 2 Đại số 8

A. x2 – 4                    

B. 3( x -2 )                        

C. 3( x + 2 )               

D. 3( x + 2 )(x-2)               

A. 6

B. 3

C. 3( x- 2 )

D. 3x

A. 2x2 – 5x – 3 

B. 2x2 – 5x + 3 

C. 2x2 + 5x + 3

D. 2x2 + 5x – 3 

A. x = ± 4/3.

B. x ≠ ± 4/3.

C. - 4/3 < x < 4/3.

D.  x > 4/3

A. x = ± 4

B. x ≠ 1.

C. x = 0

D. x = -1

A. \(\frac{{16xy}}{{24x}};\frac{{2y}}{3}\)

B. \(\frac{3}{{24x}};\frac{{2y}}{{16xy}}\)

C. \(\frac{{-16xy}}{{24x}};\frac{{-2y}}{3}\)

D. \(\frac{{ - {x^2}y}}{{24x}};\frac{{xy}}{{3y}}\)

A. -2x2y

B. x2y4

C. -2xy4

D. -x3y

A. \(\frac{1}{{{x^2} + 1}}\)

B. \(\frac{{x + 1}}{2}\)

C. x2 - 5

D. \(\frac{{x - 1}}{0}\)

A. \(\frac{{2\left( {x - 1} \right)}}{{{x^2} - 1}}\)

B. \(\frac{{2\left( {x + 1} \right)}}{{{{\left( {x - 1} \right)}^2}}}\)

C. \(\frac{{2\left( {x + 1} \right)}}{{{x^2} - 1}}\)

D. \(\frac{{2\left( {x - 1} \right)}}{{{{\left( {x + 1} \right)}^2}}}\)

A. x = 2

B. x = 3

C. x ≠ 2,x ≠ 3.

D. x = 0

A. \(\frac{{ - 6}}{{ - x - 3}}\)

B. \(\frac{{2x}}{{{x^2} - 3x}}\)

C. \(\frac{{2\left( {x + 1} \right)}}{{{x^2} + 4x + 3}}\)

D. \(\frac{{2y}}{{xy - 3y}}\)

A. x2 - 4x

B. x2 + 4x

C. x2 + 4

D. x2 - 4

A. \(\frac{6}{8}\)

B. \(\frac{{3x}}{{4{y^3}}}\)

C. 2xy2

D. \(\frac{{{x^2}{y^2}}}{{x{y^5}}}\)

A. \(\frac{{x - 4}}{x}\)

B. \(\frac{{x + 4}}{x-4}\)

C. \(\frac{{x + 4}}{-x}\)

D. \(\frac{{4-x}}{-x}\)

A. \(\frac{{3\left( {x + 1} \right)}}{{4xy\left( {x + 2} \right)}}\)

B. \(\frac{3}{{4xy\left( {x + 1} \right)}}\)

C. \(\frac{{3x\left( {x + 1} \right)}}{{4y\left( {x + 2} \right)}}\)

D. \(\frac{3}{{4x\left( {x + 2} \right)}}\)

A. \(\frac{{ - x - 2}}{{x + 8}}\)

B. \(\frac{{x + 2}}{{x - 8}}\)

C. \(\frac{{x + 2}}{{x + 8}}\)

D. \(\frac{{ - x - 2}}{{x - 8}}\)

A. \(\frac{{{x^2} - {y^2}}}{{x - y}} = x + y\)

B. \(\frac{{1 - {x^3}}}{{{x^2} + x + 1}} = 1 - x\)

C. \(\frac{{{x^3} - 1}}{{{x^2} + x + 1}} = x - 1\)

D. \(\frac{{{x^2} + {y^2}}}{{{y^2}}} = {x^2}\)

A. \(8{x^2}{y^3}z\)

B. \(12{x^3}{y^3}z\)

C. \(24{x^2}{y^3}z\)

D. \(12{x^2}{y^3}z\)

A. x2 - 9 

B. 2(x2 - 9 )

C. x2 + 9 

D. x - 3

A. \({x^3} + 6{x^2} + 3x - 10\)

B. \({x^3} - 6{x^2} + 3x - 10\)

C. \({x^3} + 6{x^2}+3x - 10\)

D. \({x^3} + 6{x^2}+3x + 10\)

A. \(\frac{{{x^2} + 4x + 1}}{{2\left( {{x^2} - 1} \right)}}\)

B. \(\frac{{x - 1}}{{2\left( {x + 1} \right)}}\)

C. \(\frac{{x + 1}}{{2{{\left( {x - 1} \right)}^2}}}\)

D. \(\frac{{{x^2} + 1}}{{2\left( {{x^2} - 1} \right)}}\)

A. 3

B. -3

C. 4

D. -4

A. 3 - x

B. x - 3

C. x + 3

D. -x - 3

A. \(\frac{{2x + y}}{{xy}}\)

B. \(\frac{{2x - y}}{{xy}}\)

C. \(\frac{{-2x - y}}{{xy}}\)

D. \(\frac{{ y-2x}}{{xy}}\)

A. \(\frac{1}{{xy}}\)

B. \(\frac{-1}{{xy}}\)

C. \(\frac{{x - 1}}{{xy}}\)

D. \(\frac{{1-x}}{{xy}}\)

A. 1/2

B. -1/2

C. \(\frac{1}{{10x - 4}}\)

D. \(\frac{-1}{{10x - 4}}\)

A. \( - \frac{1}{x}\)

B. \(\frac{1}{{x + 3}}\)

C. \(\frac{1}{x}\)

D. \(\frac{-1}{{x + 3}}\)

A. \(\frac{3}{{{x^2} - 1}}\)

B. \(\frac{3}{{1 - {x^2}}}\)

C. 3

D. -3

A. x = 2

B. x ≠ 2.

C. x > 2

D. x < 2

A. (x - 1)2

B. -(x - 1)2

C. (x + 1)2

D. -(x + 1)2

A. \(\frac{x}{{3\left( {x - 1} \right)}}\)

B. \(\frac{1}{{3\left( {x - 1} \right)}}\)

C. \(\frac{x-1}{{3\left( {x - 1} \right)}}\)

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

A. A = 1

B. A = -2

C. A = -1

D. A = 2