题目内容
化简下列各数:
-(-68)=
-(+3.8)=
-[+(-3
)]=
-(+0.75)=
+(-3)=
-[-(+2)]=
-(-
)=
+(+6)=
-[-(-2)]=
-(-68)=
68
68
-(+3.8)=
-3.8
-3.8
-[+(-3
| 1 |
| 2 |
3
| 1 |
| 2 |
3
| 1 |
| 2 |
-(+0.75)=
-0.75
-0.75
+(-3)=
-3
-3
-[-(+2)]=
2
2
-(-
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
+(+6)=
6
6
-[-(-2)]=
-2
-2
.分析:根据相反数的定义化简即可.
解答:解:-(-68)=68;
-(+3.8)=-3.8;
-[+(-3
)]=3
;
-(+0.75)=-0.75;
+(-3)=-3;
-[-(+2)]=2;
-(-
)=
;
+(+6)=6;
-[-(-2)]=-2.
故答案为:68;-3.8;3
;-0.75;-3;2;
;6;-2.
-(+3.8)=-3.8;
-[+(-3
| 1 |
| 2 |
| 1 |
| 2 |
-(+0.75)=-0.75;
+(-3)=-3;
-[-(+2)]=2;
-(-
| 3 |
| 5 |
| 3 |
| 5 |
+(+6)=6;
-[-(-2)]=-2.
故答案为:68;-3.8;3
| 1 |
| 2 |
| 3 |
| 5 |
点评:本题考查了相反数的定义,是基础题,熟记概念是解题的关键.
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