题目内容
计算:
①(-7
)2
②3
×(-
)÷
③4
÷
-
+4
④6-2
-3
.
①(-7
|
②3
3
|
| 1 |
| 8 |
1
|
| 1 |
| 2 |
5
|
③4
| 5 |
| 45 |
| 8 |
| 2 |
④6-2
|
|
①原式=49×
=
;
②原式=-
÷
=-
=-
;
③原式=4
+3
-2
+4
=7
+2
;
④原式=6-
-
=6-
.
| 3 |
| 14 |
=
| 21 |
| 2 |
②原式=-
| 3 |
| 8 |
|
| 1 |
| 2 |
|
=-
| 3 |
| 4 |
|
=-
| 3 |
| 4 |
③原式=4
| 5 |
| 5 |
| 2 |
| 2 |
=7
| 5 |
| 2 |
④原式=6-
| 6 |
3
| ||
| 2 |
=6-
5
| ||
| 2 |
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