Trắc nghiệm Phép cộng, phép trừ các phân thức đại số có đáp án ( Thông hiểu)

A. $\frac{x^2+4}{x-2}-\frac{4x}{2-x}$

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

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

D. $\frac{x}{x-2}+\frac{2}{x-2}$

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

B. $2$

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

D. $\frac{2x^2}{x^2-1}$

A. 2x ² + 5x - 4

B. $\frac{2x^2-5x-4}{12x(x-1\left)\right(x+1)}$

C. $2x2-4x-4$

D. 2x ² - 5x - 4

A. $\frac{1}{x+2}-\frac{1}{(x+2\left)\right(4x+7)}=\frac{4x}{(x+2\left)\right(4x+7)}$

B. $\frac{2-21x}{18}-\frac{4+x}{12}=\frac{75x-16}{36}$

C. $\frac{1}{x+4}-\frac{1}{x+5}=\frac{1}{(x+4\left)\right(x+5)}$

D. $\frac{2}{x-5}+\frac{3x}{x^2-25}=\frac{4x+5}{x^2-25}$

A. $\frac{3x-4}{4x^2{y}^5}+\frac{9x+4}{4x^2{y}^5}=\frac{3}{{\mathrm{xy}}^4}$

B. $\frac{2x+5}{3}+\frac{x-2}{3}=\frac{x+1}{3}$

C. $\frac{x+8}{x-1}-\frac{2x-1}{x-1}-\frac{6x+2}{x-1}=7$

D. $\frac{x}{x-y}+\frac{y}{x+y}+\frac{2y^2}{x^2-y^2}=\frac{x+y}{x-y}$

A. $\frac{11x+13}{3x-3}+\frac{15x+17}{4-4x}=\frac{-1}{12}$

B. $\frac{11x+13}{3x-3}+\frac{15x+17}{4-4x}=\frac{-x-1}{12(x-1)}$

C. $\frac{\mathrm{xy}}{x^2-y^2}-\frac{x^2}{y^2-x^2}=\frac{x}{x-y}$

D. $\frac{\mathrm{xy}}{x^2-y^2}-\frac{x^2}{y^2-x^2}=\frac{-x}{y-x}$

A. $\frac{2a}{a-1}$

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

C. $\frac{2a}{a+1}$

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

A. $\frac{-2}{x-3}$

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

C. $\frac{2}{x+3}$

D. $\frac{2}{x-3}$

A. $\frac{-12x}{x^3-1}$

B. $\frac{-12}{x^3-1}$

C. $\frac{-x}{x^3-1}$

D. $\frac{3}{x^3-1}$

A. x

B. x+1

C. $\frac{x}{x-1}$

D. $\frac{x}{x+1}$

A. x

B. x+1

C. $\frac{x}{x-1}$

D. $\frac{x}{x+1}$