题目内容
计算:(1)
÷(-2)2-2-1+
;
(2)
(
-2
)-(3
-
)2.
| 12 |
| 1 | ||
|
(2)
| 18 |
|
| 5 |
| 2 |
| 5 |
(1)原式=2
÷4-
+
=
;
(2)原式=(
-
×2
)-[(3
)2+2(3
)(-
)+(-
)2],(2分)
=(3-6
)-(23-6
),(2分)
=-20.(5分)
| 3 |
| 1 |
| 2 |
| ||
| 2 |
| 3 |
(2)原式=(
18×
|
| 18 |
| 5 |
| 2 |
| 2 |
| 5 |
| 5 |
=(3-6
| 10 |
| 10 |
=-20.(5分)
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