题目内容
计算:
①
-
+
②
+4
-|-2
|-2
③(2
+3
)2-(2
-3
)2
④(
+1)2(2
-3).
①
| 27 |
| 12 |
| 45 |
②
| 12 |
|
| 2 |
| 0.75 |
③(2
| 3 |
| 2 |
| 3 |
| 2 |
④(
| 2 |
| 2 |
(1)原式=3
-2
+3
=
+3
;
(2)原式=2
+
-2
-
=
-
;
(3)原式=(2
+3
+2
-3
)(2
+3
-2
+3
)=4
×6
=24
;
(4)原式=(2
+3)(2
-3)=8-9=1.
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |
(2)原式=2
| 3 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
(3)原式=(2
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 6 |
(4)原式=(2
| 2 |
| 2 |
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