题目内容
计算:
(1)
-3
+
;
(2)(1-2
)(2
+1)+(2
-1)2;
(3)(2
-3
)×
;
(4)(-
)0+(
)-1+
+
.
(1)
| 32 |
|
|
(2)(1-2
| 3 |
| 3 |
| 3 |
(3)(2
| 12 |
|
| 6 |
(4)(-
| 1 |
| 2 |
| ||
| 2 |
| 2 | ||
|
(
|
(1)原式=4
-
+
=
;
(2)原式=2(1-2
)=2-4
;
(3)原式=2
-3
=12
-3
=9
;
(4)原式=1+
+(
+1)+2-
=
.
| 2 |
3
| ||
| 2 |
| ||
| 4 |
11
| ||
| 4 |
(2)原式=2(1-2
| 3 |
| 3 |
(3)原式=2
| 72 |
| 2 |
| 2 |
| 3 |
| 3 |
(4)原式=1+
| 2 |
| 3 |
| 3 |
| 2 |
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