-1

来源：学生作业帮助网编辑：六六作业网时间：2024/11/17 16:25:50

-1-1-1IX-2I-IX+1I+2IX-4I＝2-x-x-1+2(4-x)=1-2x+8-2x=9-4x

-1
-1

-1
IX-2I-IX+1I+2IX-4I
＝2-x-x-1+2(4-x)
=1-2x+8-2x
=9-4x

1 1 1 1 1 1 1 -1 1 -1 1 1 1 1 (1~ 1 1 1: