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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