题目内容
计算或化简:
(1)(
-1)2;
(2)
+
-
.
(1)(
| 2 |
(2)
| 5 |
| 1 | ||
|
|
(1)原式=(
)2-2
+1
=2-2
+1
=3-2
;
(2)原式=
+
-
=
.
| 2 |
| 2 |
=2-2
| 2 |
=3-2
| 2 |
(2)原式=
| 5 |
| ||
| 5 |
2
| ||
| 5 |
=
4
| ||
| 5 |
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2
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4
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