Bài tập Toán 8: Phân thức đại số có đáp án !!

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 = -4.   

D. x = - 1. 

A. $\frac{-x^{2}y}{3xy}$ và $\frac{xy}{ 3y}$ 

B. $\frac{-x^{2}y}{xy}$ và $\frac{3y}{ xy}$ 

C. $\frac{3}{24x}$ và $\frac{2y}{ 16xy}$ 

A. $-2x^{2}y$ 

B. $x^2{y}^4$. 

C. $-2x{y}^4$.   

D. $-x^{3}y$. 

A. $\frac{-3x{y}^2}{1}$ 

B. $\frac{-3x{y}^2}{x}$ 

C. $\frac{-3x{y}^2}{y}$ 

D. $\frac{-3x{y}^2}{xy}$ 

A. $\frac{x^2{y}^2}{xy}$ 

B. $\frac{x^2{y}^2}{4xy}$ 

C. $\frac{2x^2{y}^2}{4xy}$ 

D. $\frac{x^2{y}^2}{4y}$ 

A. a = -2x     

B. a =-x 

C. a = -y     

D. a = -1 

A. $4x^2{y}^3$ 

B. $x^3{y}^4$ 

C. $4x^3{y}^4$ 

D. $4x^{3}y$ 

A. $x^3{y}^3$ 

B. $x^2{y}^3$ 

C. $x^3{y}^2$ 

D. $2x^3{y}^3$ 

A. $A = x^2 + 2x - 3$

B. $A = x^2 + 2x + 3$

C. $A = x^2 - 2x - 3$

D. $A = x^2 + 2x$

$A. A = 2x^2 + x + 10$

$B. A = 2x^2 + x - 10$

$C. A = 2x^2 - x - 10$

$D. A = x^2 + x - 10$

A. x = 3

B. x ≠ 3

C. x ≠ 2

D. $\left\{\begin{array}{l}\text{x}\ne \text{2}\\ \text{x}\ne \text{3}\end{array}\right.$

A. x = 2

B. x ≠ 1

C. x = -2

D. x = -1

A. $x > \frac{\text{5}}{\text{2}}$

B. $x < \frac{\text{5}}{\text{2}}$

C. $x < -\frac{\text{5}}{\text{2}}$

D. $x > 5$

A. $x > -\frac{\text{9}}{\text{4}}$

B. $x < \frac{\text{9}}{\text{4}}$

C. $x > \frac{\text{9}}{\text{4}}$

D. $x < -\frac{\text{9}}{\text{4}}$

A. 2

B. 3

C. 1

D. 4

A. 2

B. 3

C. 1

D. 4

A. $\frac{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}{\text{(x}-{\text{y)y}}^{\text{2}}}$

B. $\frac{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}{\text{x}+\text{y}}$

C. $\frac{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}{\text{x}-\text{y}}$

D. $\frac{{\text{x}}^{\text{2}}-{\text{y}}^{\text{2}}}{{\text{(x}-\text{y)}}^{\text{2}}\text{(x}+\text{y)}}$

A. C = x + 2

B. $C = x^2 + 2$

C. C = x(x + 2)

D. C = x(x - 2)

A. $\frac{1}{9}$

B. $\frac{1}{3}$

C. 3

D. 9

A. $\frac{\text{x}-\text{6}}{{\text{3x}}^{\text{2}}-\text{4}}$

B. $\frac{\text{x}-\text{2}}{{\text{3x}}^{\text{2}}-\text{4}}$

C. $\frac{\text{x}-\text{6}}{{\text{x}}^{\text{2}}-\text{4}}$

D. $\frac{\text{3x}-\text{2}}{{\text{3x}}^{\text{2}}-\text{4}}$

A. 4

B. 8

C. 16

D. 2

A. $\frac{{\text{ab}}^{\text{2}}}{{\text{cd}}^{\text{2}}}$

B. $\frac{\text{ad}}{\text{bc}}$

C. $\frac{\text{ab}}{\text{cd}}$

D. $\frac{\text{cd}}{\text{ab}}$

A. $\frac{{\text{(a}+\text{b)}}^{\text{2}}}{{\text{a}}^{\text{2}}-{\text{b}}^{\text{2}}}=\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{{\text{(a}-\text{b)}}^{\text{2}}}$

B. $\frac{{\text{(a}+\text{b)}}^{\text{2}}}{{\text{a}}^{\text{2}}-{\text{b}}^{\text{2}}}>\text{2}\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{{\text{(a}-\text{b)}}^{\text{2}}}$

C. $\frac{{\text{(a}+\text{b)}}^{\text{2}}}{{\text{a}}^{\text{2}}-{\text{b}}^{\text{2}}}>\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{{\text{(a}-\text{b)}}^{\text{2}}}$

D. $\frac{{\text{(a}+\text{b)}}^{\text{2}}}{{\text{a}}^{\text{2}}-{\text{b}}^{\text{2}}}<\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{{\text{(a}-\text{b)}}^{\text{2}}}$