题目内容
计算:(1)(3
-2
+
)÷2
(2)(2
+5)2011(2
-5)2013.
| 12 |
|
| 48 |
| 3 |
(2)(2
| 6 |
| 6 |
(1)原式=(6
-
+4
)÷2
=
÷2
=
;
(2)原式=[(2
+5)(2
-5)]2011(2
-5)2
=(24-25)(24-20
+25)
=20
-49.
| 3 |
2
| ||
| 3 |
| 3 |
| 3 |
=
| 28 |
| 3 |
| 3 |
| 3 |
=
| 14 |
| 3 |
(2)原式=[(2
| 6 |
| 6 |
| 6 |
=(24-25)(24-20
| 6 |
=20
| 6 |
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