题目内容
计算
①2
+4
-3
-
②(
-1)2-(
-
)(
+
).
①2
| 12 |
|
| 48 |
|
②(
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
(1)原式=4
+4×
-12
-
=-
;
(2)原式=(
)2-2
+1-[(
)2-(
)2]
=3-2
+1-(2-3)
=3-2
.
| 3 |
| ||
| 9 |
| 3 |
2
| ||
| 3 |
74
| ||
| 9 |
(2)原式=(
| 3 |
| 3 |
| 2 |
| 3 |
=3-2
| 3 |
=3-2
| 3 |
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