(1)将分式x/[(ax+b)(cx+d)(ex+f)(gx+h)]化为部分分式的和.
(2)将分式x^2/[(ax+b)(cx+d)(ex+f)(gx+h)]化为部分分式的和.
(3)将分式x^3/[(ax+b)(cx+d)(ex+f)(gx+h)]化为部分分式的和.
(4)将分式(lx^3+mx^2+nx+r)/[(ax+b)(cx+d)(ex+f)(gx+h)]化为部分分式的和.