题目内容
请你计算(要注意符号和检查)
(1)(-53)+(+21)-(-69)-(+37)
(2)-
+
-
+
(3)[(-7)-(-10)]-(-8)
(4)-0.5+(-15
)-(-17.5)-|-12
|
(5)(-3)×(-
)×(-
)×
.
(1)(-53)+(+21)-(-69)-(+37)
(2)-
| 7 |
| 12 |
| 6 |
| 11 |
| 5 |
| 12 |
| 5 |
| 11 |
(3)[(-7)-(-10)]-(-8)
(4)-0.5+(-15
| 1 |
| 3 |
| 2 |
| 3 |
(5)(-3)×(-
| 7 |
| 5 |
| 1 |
| 3 |
| 4 |
| 7 |
(1)(-53)+(+21)-(-69)-(+37)=-53+21+69-37=0;
(2)-
+
-
+
=-
-
+
+
=0;
(3)[(-7)-(-10)]-(-8)=3-(-8)=11;
(4)-0.5+(-15
)-(-17.5)-|-12
|=-0.5+17.5-15
-12
=17-28=-11;
(5)(-3)×(-
)×(-
)×
=-
×
=-
.
(2)-
| 7 |
| 12 |
| 6 |
| 11 |
| 5 |
| 12 |
| 5 |
| 11 |
| 7 |
| 12 |
| 5 |
| 12 |
| 6 |
| 11 |
| 5 |
| 11 |
(3)[(-7)-(-10)]-(-8)=3-(-8)=11;
(4)-0.5+(-15
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
(5)(-3)×(-
| 7 |
| 5 |
| 1 |
| 3 |
| 4 |
| 7 |
| 7 |
| 5 |
| 4 |
| 7 |
| 4 |
| 5 |
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