\(=\dfrac{x^2+2x+1+x^2-4x+4+x-14}{\left(x-2\right)\left(x+2\right)}=\dfrac{2x^2-x-9}{\left(x-2\right)\left(x+2\right)}\)
Tính:
a)\(\dfrac{2x+4}{x^3-1}\)-\(\dfrac{2}{x+1}\)+\(\dfrac{x+2}{x^2+x+1}\)
b) \(\dfrac{x-1}{x^2-5x+6}\)-\(\dfrac{x-3}{x-2}\)+\(\dfrac{x-2}{x-3}\)
Thực hiện phép tính:
a) \(\dfrac{x}{2x-y}-\dfrac{2x-y}{4x-2y}\)
b)\(\dfrac{3x+1}{x^2-1}-\dfrac{x}{2x-2}\)
c) \(\dfrac{x-2}{x^2-4}-\dfrac{-8-x}{3x^2+6x}\)
d) \(\dfrac{2}{2x-3}-\dfrac{x}{2x+3}-\dfrac{2x+1}{9-4x^2}\)
Thực hiện phép tính:
a) \(\left(x+2\right)^2\div\dfrac{3x+6}{2x-1}\)
b) \(\dfrac{2\left(x+1\right)}{x^2-4}\div\dfrac{x^2-x}{2-x}\)
Thực hiện các phép tính:
a)\(\dfrac{x+3}{x^2-9}-\dfrac{3}{x^2-3x}\)
b)\(\dfrac{7}{x}-\dfrac{x}{x-6}+\dfrac{36}{x^2-6x}\)
c)\(\dfrac{3}{x}-\dfrac{x}{x-1}-\dfrac{x^2}{x+1}-\dfrac{x^2-3}{x^3-x}\)
Thực hiện phép tính:
a) \(\dfrac{x+2y}{xy}\div\dfrac{x^2+4xy+4y^2}{2x^2}\)
b) \(\dfrac{4x^3-xy^2}{x^2+xy+y^2}\div\dfrac{\left(2x-y\right)^3}{x^3-y^3}\)
c) \(\dfrac{x+3}{x+2}\div\dfrac{3x+9}{2x-1}\div\dfrac{4x-2}{2x+4}\)
d) \(\dfrac{x+1}{x+2}\div\left(\dfrac{2x^2}{2x-3}\times\dfrac{3x+3}{4x^3}\right)\)
Thực hiện phép tính:
a, (2x-5)(5-x)
b, \(\dfrac{1}{3x-2}\)-\(\dfrac{1}{3x+2}\)
c, \(\dfrac{3}{x-3}\)-\(\dfrac{6x}{x^2-9}\)+\(\dfrac{x}{x+3}\)
Tính:
a) \(\dfrac{x+1}{2x-6}+\dfrac{2x+3}{x^2+3x}\)
b) \(\dfrac{3}{2x+6}-\dfrac{x-6}{3x^2+6}\)
c) \(\dfrac{2x+6}{3x^2-x}:\dfrac{x^2+3x}{1-3x}\)
Thực hiện phép tính
a) \(^{\dfrac{x^2+2}{x^3-1}}\) +\(\dfrac{2}{x^2+x+1}\) +\(\dfrac{1}{1-x}\)
b) \(\dfrac{1}{x+2}\) +\(\dfrac{3}{x^2-4}\) +\(\dfrac{x-14}{\left(x^2+4x+4\right)\left(x-2\right)}\)
c)\(\dfrac{1}{x-y}\) -\(\dfrac{3xy}{x^3-y^3}\) +\(\dfrac{x-y}{x^2+xy+y^2}\)
d) \(\dfrac{1}{a-b}\) +\(\dfrac{1}{a+b}\) +\(\dfrac{2a}{a^2+b^2}\) +\(\dfrac{4a^3}{a^4+b^4}\)
e) \(\dfrac{1}{a^2-a}\) + \(\dfrac{1}{a^2-3a+2}\) +\(\dfrac{1}{a^2-5a+6}\) +\(\dfrac{1}{a^2-7a+12}\)
Giải các phương trình sau: (TM ĐK)
1) \(\dfrac{11}{x}=\dfrac{9}{x+1}+\dfrac{2}{x-4}\)
2) \(\dfrac{14}{3x-12}-\dfrac{2+x}{x-4}=\dfrac{3}{8-2x}-\dfrac{5}{6}\)
3) \(\dfrac{x+5}{x^2-5x}-\dfrac{x+25}{2x^2-50}=\dfrac{x-5}{2x^2+10}\)
4) \(\dfrac{x+1}{x-1}-\dfrac{x-1}{x+1}=\dfrac{16}{x^2-1}\)
5) \(\left(1-\dfrac{x-1}{x+1}\right)\left(x+2\right)=\dfrac{x+1}{x-1}+\dfrac{x-1}{x+1}\)
mng giúp mk bài này nha. Cảm ơn bạn nhiều
