题目内容
化简与计算:
(1)
-
+
(2)(-
)2-
+
.
(1)
| 12 |
|
|
(2)(-
| 10 |
| (-7)2 |
|
(1)原式=2
-
+
,
=
-
+
,
=
;
(2)原式=10-7+
,
=3+
.
| 3 |
| ||
| 3 |
| ||
| 9 |
=
18
| ||
| 9 |
3
| ||
| 9 |
| ||
| 9 |
=
| 16 |
| 9 |
| 3 |
(2)原式=10-7+
| ||
| 2 |
=3+
| ||
| 2 |
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