23.(4分)
(1)方程式为:_________________________________________________________
(2)顺序为: _________________________________________________________
(3)方程式为:_________________________________________________________
(4)方程式为:_________________________________________________________
22.(4分)
(1)____________ (2)____________ (3)___________ (4)____________
21.(5分)
(1)___________ (2)___________ (3)__________ (4)___________ (5)___________
2009.3
第二部分 (60分)
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