你好 (x²+mx+n)(x²-3x+2)的展开式中含x²项为2x²-3mx²+nx²=(2-3m+n)x²不含x²项则2-3m+n=0 (1)(x²+mx+n)(x²-3x+2)的展开式中含x项为2mx-3nx=(2m-3n)x=0不含x项则2m-3n=0 (2)(1)*3+(2)6-7m=0m=6/7代入(2)解得n=4/7{m=6/7n=4/7 【数学辅导团】为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!