题目内容
计算:(
-
)2×(
+
)2.
| 5 |
| 3 |
| 5 |
| 3 |
解法一:原式=[(
-
)(
+
)]2…(2分)
=[(
)2-(
)2]2=(5-3)2=4.…(2分)
解法二:原式=(5-2
+3)(5+2
+3)…(2分)
=(8-2
)(8+2
)=64-60=4.…(2分)
| 5 |
| 3 |
| 5 |
| 3 |
=[(
| 5 |
| 3 |
解法二:原式=(5-2
| 15 |
| 15 |
=(8-2
| 15 |
| 15 |
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