Ax+B/x-3=5x/x-3+3x-1/3-x
(Ax+B)/(x-3)=5x/(x-3)+(3x-1)/(3-x)
(Ax+B)/(x-3)=(5x-3x+1)/(x-3)
Ax+B=2x+1
A=2 ,B=1
则A=(2 ),B=(1 )