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

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

C. $x^2-5$

D. $\frac{(x+1)}{0}$

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. $\left(\begin{array}{c}\text{x}\ne \text{2}\\ \text{x}\ne \text{3}\end{array}\right)$

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