题目内容
计算:
(1)(
)-2-(
-1)0+
(2)(
+
)÷
.
(1)(
| 1 |
| 3 |
| 3 |
| 5 | ||
|
(2)(
| 1 |
| a |
| 1 |
| b |
| a+b |
| b |
(1)(
)-2-(
-1)0+
=9-1+
=8+5
-5
=3+5
(2)(
+
)÷
.
=
×
=
.
| 1 |
| 3 |
| 3 |
| 5 | ||
|
=9-1+
5(
| ||||
(
|
=8+5
| 2 |
=3+5
| 2 |
(2)(
| 1 |
| a |
| 1 |
| b |
| a+b |
| b |
=
| a+b |
| ab |
| b |
| a+b |
=
| 1 |
| a |
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