题目内容
计算:
(1)
+6
-2x
.
(2)(
+
)2-(
-
)2.
(1)
| 2 |
| 3 |
| 9x |
|
|
(2)(
| 3 |
| 2 |
| 3 |
| 2 |
(1)原式=2
+3
-2
=3
;
(2)原式=(
+
+
-
)(
+
-
+
)
=2
•2
=4
.
| x |
| x |
| x |
| x |
(2)原式=(
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
=2
| 3 |
| 2 |
=4
| 6 |
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