题目内容
计算与化简
(1)(
+
)-1+
+
+
+
(2)(1+
-
)(1-
+
)+2
.
(1)(
| 3 |
| 2 |
| (-2)2 |
| 3 | -8 |
| 1 | ||||
|
| 1 | ||||
|
(2)(1+
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
(1)原式=
-
+2-2+
+
=
-
+
;
(2)原式=[1+(
-
)][1-(
-
)]+2
=1-(
-
)2+2
=1-5+2
+2
=-4.
| 3 |
| 2 |
| ||||
| 2 |
| ||||
| 2 |
| 3 |
| 2 |
| 5 |
(2)原式=[1+(
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
| 2 |
| 3 |
| 6 |
| 6 |
| 6 |
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