题目内容
计算下列各题.
(1)[-2-3-8-1×(-1)-2]×(-
)-2×90
(2)2 -1-(-
)-2+(
)0.
(1)[-2-3-8-1×(-1)-2]×(-
| 1 |
| 2 |
(2)2 -1-(-
| 2 |
| 3 |
| 3 |
| 2 |
(1)[-2-3-8-1×(-1)-2]×(-
)-2×90
=(-
-
×1)×4×1
=-
×4
=-1;
(2)2-1-(-
)-2+(
)0
=
-
+1
=
-
=-
.
| 1 |
| 2 |
=(-
| 1 |
| 8 |
| 1 |
| 8 |
=-
| 1 |
| 4 |
=-1;
(2)2-1-(-
| 2 |
| 3 |
| 3 |
| 2 |
=
| 1 |
| 2 |
| 9 |
| 4 |
=
| 3 |
| 2 |
| 9 |
| 4 |
=-
| 3 |
| 4 |
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