Tìm các số A , B , C để có

a) \(\frac{x^2-x+2}{\left(x-1\right)^3}=\frac{A}{\left(x-1\right)^3}+\frac{B}{\left(x-1\right)^2}+\frac{C}{x-1}\)

b) \(\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+1\right)}=\frac{A}{x-1}+\frac{Bx+C}{x^2+1}\)

Tìm các sô A; B; C để có :

a) \(\frac{x^2-x+2}{\left(x-1\right)^3}=\frac{A}{\left(x-1\right)^3}+\frac{B}{\left(x-1\right)^2}+\frac{C}{x-1}\)

b) \(\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+1\right)}=\frac{A}{x-1}+\frac{Bx+C}{x^2+1}\)

tìm a,b,c sao cho

\(\frac{1}{\left(x^2+1\right)\cdot\left(x-1\right)}=\frac{ax+b}{x^2+1}+\frac{c}{x-1}\)

Giả và biện luận các pt sau:
\(\)1) \(\frac{ax-1}{x-1}+\frac{b}{x+1}=\frac{a\left(x^2+1\right)}{x^2-1}\)
2) \(\frac{a}{ax-1}+\frac{b}{bx-1}=\frac{a+b}{\left(a+b\right)x-1}\)
3)\(\left|2x+m\right|=\left|2m-x\right|\)
4) \(\left|mx+1\right|=\left|3x+m-2\right|\)

Tìm các số A , B , C để có

a) \(\frac{x^2-x+2}{\left(x-1\right)^3}=\frac{A}{\left(x-1\right)^3}+\frac{B}{\left(x-1\right)^2}+\frac{C}{x-1}\)

b) \(\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+1\right)}=\frac{A}{x-1}+\frac{Bx+C}{x^2+1}\)

tìm các hệ số a,b,c biết

\(\frac{1}{\left(x^2+1\right)\left(x-1\right)}=\frac{\text{ax}+b}{x^2+1}+\frac{c}{x-1}\)

CMR nếu \(\frac{x}{a}=\frac{y}{b}=\frac{z}{c}\)thì \(\left(x^2+y^2+z^2\right).\left(a^2+b^2+c^2\right)=\left(ax+bx+cz\right)^2\)

Cho đa thứ \(f\left(x\right)=x\left(x+1\right)\left(x+2\right)\left(ax+b\right)\)xác định a, b để \(f\left(x\right)-f\left(x-1\right)=x\left(x+1\right)\left(2x+1\right)\)\(\forall x\)

Tìm các số A,B,C để có

a, \(\frac{x^2-x+2}{\left(x-1\right)^3}=\frac{A}{\left(x-1\right)^3}+\frac{B}{\left(x-1\right)^2}+\frac{C}{x-1}\)

b, \(\frac{x^2+2x-1}{\left(x-1\right)\left(x^2+1\right)}=\frac{A}{x-1}+\frac{Bx}{x^2+1}\)

Cho đẳng thức : 

\(\frac{1}{\left(x^2+1\right)\left(x-1\right)}=\frac{ax+b}{x^2+1}+\frac{c}{x-1}\)

Tìm a , b , c