原式=1/512*x^9-63/128*i*3^(1/2)*x^6-27/128*x^7+9/512*i*3^(1/2)*x^8+567/256*x^5+567/256*i*3^(1/2)*x^4-567/128*x^3-243/128*i*x^2*3^(1/2)+729/512*x+81/512*i*3^(1/2)
然后相加就行
原式=1/512*x^9-63/128*i*3^(1/2)*x^6-27/128*x^7+9/512*i*3^(1/2)*x^8+567/256*x^5+567/256*i*3^(1/2)*x^4-567/128*x^3-243/128*i*x^2*3^(1/2)+729/512*x+81/512*i*3^(1/2)
然后相加就行