题目内容
计算:(2
-
)2-(2
+
)2.
| 2 |
| 7 |
| 8 |
| 2 |
| 7 |
| 8 |
原式=(2
-
+2
+
)(2
-
-2
-
)
=4
×(-
)
=-7
.
| 2 |
| 7 |
| 8 |
| 2 |
| 7 |
| 8 |
| 2 |
| 7 |
| 8 |
| 2 |
| 7 |
| 8 |
=4
| 2 |
| 7 |
| 4 |
=-7
| 2 |
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