题目内容
计算:
(1)(-7
)2
(2)
×(-9
)
(3)4
+
-
+4
(4)6-2
-3
.
(1)(-7
|
(2)
| 2 |
| 3 |
3
|
| 45 |
(3)4
| 5 |
| 45 |
| 8 |
| 2 |
(4)6-2
|
|
(1)原式=49×
=
;
(2)
×(-27
)=-
×27
=-45
;
(3)原式=4
+3
-2
+4
=7
+2
;
(4)原式=6-
-
=6-
.
| 3 |
| 14 |
| 21 |
| 2 |
(2)
| 2 |
| 3 |
|
| 5 |
| ||
| 3 |
| 5 |
| 3 |
(3)原式=4
| 5 |
| 5 |
| 2 |
| 2 |
=7
| 5 |
| 2 |
(4)原式=6-
| 6 |
3
| ||
| 2 |
5
| ||
| 2 |
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