x+1/（x-2）=（a²+2a+1）/a(x²-2x+1)/（x-2）=（a²+2a+1）/aa(x²-2x+1)=(a²+2a+1)(x-2)ax²-(a²+4a+1)x+(2a²+5a+2)=0ax²-(a²+4a+1)x+(a+2)(2a+1)=0(x-a-2)(ax-2a-...