(1)-[-(+2)]=________
(2?)-[-(-2007)]=________
(3)-[+(-27)]=________
(4)=________.
网友回答
2 -2007 27
解析分析:(1)根据去括号的顺序先去小括号、再去中括号即可.
(2)根据去括号的顺序先去小括号、再去中括号即可.
(3)根据去括号的顺序先去小括号、再去中括号即可.
(4)根据去括号的顺序先去小括号、再去中括号即可.
解答:(1)-[-(+2)]=-(-2)=2;
(2 )-[-(-2007)]=-2007;
(3)-[+(-27)]=-(-27)=27;
(4)=-(-)=.
故