（x-4）/（x²+x-2）=1/(x-1)+(x-6)/(x²-4)(x-4)/(x-1)(x+2)=1/(x-1)+(x-6)/(x-2)(x+2)(x-4)(x-2)=(x-2)(x+2)+(x-6)(x-1)x²-6x+8=x²-4+x²-7x+6x²-6x+8-2x²+7x-2=0x²+x+6=0△...