问题 解答题
(1)-[-(+2)]=______
(2 )-[-(-2007)]=______
(3)-[+(-27)]=______
(4)-{+[-(+
2
3
)]}
=______.
答案

(1)-[-(+2)]=-(-2)=2;

(2 )-[-(-2007)]=-2007;

(3)-[+(-27)]=-(-27)=27;

(4)-{+[-(+

2
3
)]}=-(-
2
3
)=
2
3

故答案为:(1)2;(2)-2007;(3)27;(4)

2
3

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