题目内容
计算(2
+
)(2
-
)+
=______.
| 3 |
| 6 |
| 3 |
| 6 |
| ||
|
(2
+
)(2
-
)+
=(2
)2-(
)2+
=12-6+
=6-[(
)2-4
+22]
=6-3+4
-4
=4
-1.
| 3 |
| 6 |
| 3 |
| 6 |
| ||
|
=(2
| 3 |
| 6 |
(
| ||||
(
|
=12-6+
(
| ||
| -1 |
=6-[(
| 3 |
| 3 |
=6-3+4
| 3 |
=4
| 3 |
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