题目内容
计算.
(1)2
×
÷
;
(2)
-
+3
;
(3)a
-2a2
+3
;
(4)(
+
)(
-
)-(
-
)2;
(5)(
+1)2009(
-1)2010.
(1)2
| 3 |
| 1 |
| 4 |
2
|
| 1 |
| 2 |
| 2 |
(2)
| 18 |
| 50 |
| 8 |
(3)a
| 8a |
|
| 2a3 |
(4)(
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
| 2 |
(5)(
| 2 |
| 2 |
(1)2
×
÷
=2
×
×
×
=2;
(2)
-
+3
=3
-5
+6
=4
;
(3)a
-2a2
+3
=2a
-
+3a
=
;
(4)(
+
)(
-
)-(
-
)2=5-2-(5-2
)=2
-2;
(5)(
+1)2009(
-1)2010=[(
+1)(
-1)]2009•(
-1)=
-1.
| 3 |
| 1 |
| 4 |
2
|
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
2
| ||
| 3 |
| 2 | ||
|
(2)
| 18 |
| 50 |
| 8 |
| 2 |
| 2 |
| 2 |
| 2 |
(3)a
| 8a |
|
| 2a3 |
| 2a |
| 2a2 |
| 4a |
| 2a |
| 2a |
9a
| ||
| 2 |
(4)(
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
| 2 |
| 6 |
| 6 |
(5)(
| 2 |
| 2 |
| 2 |
| 2 |
| 2 |
| 2 |
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