题目内容
计算:(
+2
+
)(
-2
+
)
| 5 |
| 3 |
| 2 |
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| 3 |
| 2 |
原式=[(
+
)+2
]×[(
+
)-2
]
=(
+
)2-(2
)2
=5+2
+2-12
=2
-5.
| 5 |
| 2 |
| 3 |
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| 2 |
| 3 |
=(
| 5 |
| 2 |
| 3 |
=5+2
| 10 |
=2
| 10 |
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