化简下列各数的符号.(1)+(-2)(2)-(-二分之五)(3)-[-(+3)] (4)-[-(-2)] (5)-{+[-(+5)]}(6) -{-[+(-9)]}
问题描述:
化简下列各数的符号.
(1)+(-2)
(2)-(-二分之五)
(3)-[-(+3)]
(4)-[-(-2)]
(5)-{+[-(+5)]}
(6) -{-[+(-9)]}
答
(1)+(-2)=-2
(2)-(-二分之五)=二分之五
(3)-[-(+3)]=3
(4)-[-(-2)]=-2
(5)-{+[-(+5)]}=5
(6) -{-[+(-9)]}=-9
答
1.+(-2)=-2
2.-(-5/2)=5/2
3.-[-(+3)]=3
4.-[-(-2)]=+(-2)=-2
5.-{+[-(+5)]}
=-[-(+5)]=+(+5)=5
6.-{-[+(-9)]}
=+[+(-9)]=+(-9)=-9
答
(1)-2
(2)5/2
(3)3
(4)-2
(5)5
(6)-9
答
-2;二分之五;3;-2;5;-9