bài 3 quy đồng mẫu các phân thức sau:

a,\(\dfrac{10}{x+2};\dfrac{5}{2x-4}và\dfrac{1}{6-3x}\)

b.\(\dfrac{2x}{x^3+1};\dfrac{-3}{x^2-x+1}và\dfrac{x}{x+1}\)

c,\(\dfrac{x}{x^3-27};\dfrac{x+2}{x^2-6x+9}và\dfrac{x-1}{x^2+3x+9}\)

d,\(\dfrac{4x^2-3x+5}{x^3-1};\dfrac{1-2x}{x^2+x+1}và-2\)

e,\(\dfrac{1}{2x+4};\dfrac{x}{2x-4}và\dfrac{3}{4-x^2}\)

f,\(\dfrac{x}{x^3+1};\dfrac{x+1}{x^2+x}và\dfrac{x+2}{x^2-x+1}\)

g,\(\dfrac{3x^2-4x+1}{x^2-25};\dfrac{x-3}{5-x}và\dfrac{4x}{x+5}\)

h,\(\dfrac{24}{4x^3-x};\dfrac{4x}{x-2x^2}và\dfrac{18}{2x^2+x}\)

bài 1 quy đồng các phân thức sau:

a,\(\dfrac{6}{7xy^2z}và\dfrac{11}{14x^2y^3z^3}\)

b,\(\dfrac{2x+1}{6xy^3}và\dfrac{3x}{9x^2y}\)

c,\(\dfrac{13z}{63x^2y^3};\dfrac{-y}{15xz^2}và\dfrac{2x}{9y^2z}\)

d,\(\dfrac{x}{x-y};\dfrac{y}{\left(x-y\right)^2}và\dfrac{1}{\left(y-x\right)^2}\)