chung to hieu bang mot phan thuc có tử bằng 1
\(\dfrac{1}{xy-x^2}-\dfrac{1}{y^2-xy}\)
3. Làm tính trừ các phân thức sau:
a) \(\dfrac{3}{2y+4}-\dfrac{1}{3y+6}\)
b) \(\dfrac{1}{2x-3}-\dfrac{1}{2x+3}\)
c) \(\dfrac{1}{xy-x^2}-\dfrac{1}{y^2-xy}\)
d) \(\dfrac{x+1}{x+4}-\dfrac{x^2-4}{x^2-16}\)
a)\(\dfrac{3}{2y+4}-\dfrac{1}{3y+6}\)
b)\(\dfrac{1}{2x-3}-\dfrac{1}{2x+3}\)
c)\(\dfrac{1}{xy-x^2}-\dfrac{1}{y^2-xy}\)
d)\(\dfrac{x+1}{x+4}-\dfrac{x^2-4}{x^2-16}\)
Thực hiện các phép tính sau :
a) \(\dfrac{3}{2x+6}-\dfrac{x-6}{2x^2+6x}\)
b) \(\dfrac{1}{xy-x^2}-\dfrac{1}{y^2-xy}\)
thực hiện phép tính sau\(\dfrac{1}{x-y}-\dfrac{3xy}{x^3-y^3}+\dfrac{x-y}{x^2+xy+y^2}\)
Làm tính trừ phân thức :
a) \(\dfrac{3x-2}{2xy}-\dfrac{7x-4}{2xy}\)
b) \(\dfrac{3x+5}{4x^3y}-\dfrac{5-15x}{4x^3y}\)
c) \(\dfrac{4x+7}{2x+2}-\dfrac{3x+6}{2x+2}\)
d) \(\dfrac{9x+5}{2\left(x-1\right)\left(x+3\right)^2}-\dfrac{5x-7}{2\left(x-1\right)\left(x+3\right)^2}\)
e) \(\dfrac{xy}{x^2-y^2}-\dfrac{x^2}{y^2-x^2}\)
f) \(\dfrac{5x+y^2}{x^2y}-\dfrac{5y-x^2}{xy^2}\)
g)\(\dfrac{x}{5x+5}-\dfrac{x}{10x-10}\)
h) \(\dfrac{x+9}{x^2-9}-\dfrac{3}{x^2+3x}\)
Trong mỗi trường hợp sau hãy tìm phân thức Q thỏa mãn điều kiện :
a) \(\dfrac{1}{x^2+x+1}-Q=\dfrac{1}{x-x^2}+\dfrac{x^2+2x}{x^3-1}\)
b) \(\dfrac{2x-6}{x^3-3x^2-x+3}+Q=\dfrac{6}{x-3}-\dfrac{2x^2}{1-x^2}\)
Cho x+y=1. C/m
\(\dfrac{x}{y^3-1}+\dfrac{y}{x^3-1}+\dfrac{2\left(xy-2\right)}{x^2y^2+3}=0\)
Thực hiện phép tính:
\(\dfrac{2\left(x+y\right)\left(x-y\right)}{x}-\dfrac{-2y^2}{x}\)
\(\dfrac{xy}{2x-y}-\dfrac{x^2-1}{y-2x}\)
\(\dfrac{4x-1}{3x^2y}-\dfrac{7x-1}{3x^2y}\)