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