题目内容
计算:
(1)(
-
)-(
+
-
);
(2)[(
-2)(1-
)+1](
-1).
(1)(
| 12 |
| 1 |
| 2 |
| 18 |
|
| 48 |
| 98 |
(2)[(
| 2 |
| 2 |
| 2 |
(1)原式=(2
-
)-(
+4
-7
)
=2
-
-
-4
+7
=-2
+
-
;
(2)原式=(
-2-2+2
+1)(
-1)
=(3
-3)(
-1)
=6-3
-3
+3
=9-6
.
| 3 |
3
| ||
| 2 |
3
| ||
| 2 |
| 3 |
| 2 |
=2
| 3 |
3
| ||
| 2 |
3
| ||
| 2 |
| 3 |
| 2 |
=-2
| 3 |
| 11 |
| 2 |
| 2 |
| 3 |
| 2 |
| 6 |
(2)原式=(
| 2 |
| 2 |
| 2 |
=(3
| 2 |
| 2 |
=6-3
| 2 |
| 2 |
=9-6
| 2 |
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