------------------------
1.因式分解：

．

++++++++++++++++++++++++++
正确答案: ['

．

']
解析:

．

省流:[['

．

']]
------------------------
------------------------
2.因式分解：

．

++++++++++++++++++++++++++
正确答案: ['

．

']
解析:

．

省流:[['

．

']]
------------------------
------------------------
3.因式分解：

．

++++++++++++++++++++++++++
正确答案: ['

．

']
解析:

．

省流:[['

．

']]
------------------------
------------------------
4.因式分解：

．

++++++++++++++++++++++++++
正确答案: ['

．

']
解析:

．

省流:[['

．

']]
------------------------