题目内容

(12分)(1)计算              
(2)解方程:
(3)计算: 

(1)
(2)
(3)
(1)计算              

=3+(-2)-      …… 2’
=1-                …… 3’
=                 …… 4’
(2)解方程: 

(3)计算: 
=        ……2’
=         ……3’
=                         …… 4’
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