每个分式减去1(x-4-x+5)/(x-5)+(x-8-x+9)/(x-9)=(x-7-x+8)/(x-8)+(x-5-x+6)/(x-6)1/(x-5)+1/(x-9)=1/(x-8)+1/(x-6)通分(2x-14)/(x-5)(x-9)=(2x-14)/(x-8)(x-6)(2x-14)[1/(x²-14x+45)-1/(x²-14x+84)]=01/(x...