题目内容
细心算一算
(1)(2
+3
)(2
-3
)
(2)
+
-
(3)|-
|+(
+1)0-
.
(1)(2
| 3 |
| 2 |
| 3 |
| 2 |
(2)
| 20 |
| 5 |
| 45 |
(3)|-
| 3 |
| 2 |
| 12 |
(1)原式=(2
)2-(3
)2
=12-18
=-6;
(2)原式=2
+
-3
=0;
(3)原式=
+1-2
=1-
.
| 3 |
| 2 |
=12-18
=-6;
(2)原式=2
| 5 |
| 5 |
| 5 |
=0;
(3)原式=
| 3 |
| 3 |
=1-
| 3 |
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