题目内容
计算:(1)|2-
|+|3-
|+|
-5|;(2)
(1-
)+
+(
-2).
| 5 |
| 7 |
| 7 |
| 1 |
| 4 |
| 81 |
| 25 |
| 3 | -1 |
(1)|2-
|+|3-
|+|
-5|,
=
-2+3-
+5-
,
=
+6-2
;
(2)原是=
×(1-3)+5+(-1)-2,
=-
+5-1-2,
=1
.
| 5 |
| 7 |
| 7 |
=
| 5 |
| 7 |
| 7 |
=
| 5 |
| 7 |
(2)原是=
| 1 |
| 4 |
=-
| 1 |
| 2 |
=1
| 1 |
| 2 |
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