题目内容
| 7 |
| 25 |
| 7 |
| 25 |
| 7 |
| 25 |
7
| 2 |
| 17 |
| 5 |
| 18 |
| 2 |
| 17 |
5
| 6 |
| 7 |
| 3 |
| 8 |
| 1 |
| 7 |
(1)
×103-
×2-
,
=
×(103-2-1),
=
×100,
=28;
(2)7
+(
-
),
=7
+
-
,
=(7
-
)+
,
=7+
,
=7
;
(3)5
-(
-
),
=5
-
+
,
=(5
+
)-
,
=6-
,
=5
.
| 7 |
| 25 |
| 7 |
| 25 |
| 7 |
| 25 |
=
| 7 |
| 25 |
=
| 7 |
| 25 |
=28;
(2)7
| 2 |
| 17 |
| 5 |
| 18 |
| 2 |
| 17 |
=7
| 2 |
| 17 |
| 5 |
| 18 |
| 2 |
| 17 |
=(7
| 2 |
| 17 |
| 2 |
| 17 |
| 5 |
| 18 |
=7+
| 5 |
| 18 |
=7
| 5 |
| 18 |
(3)5
| 6 |
| 7 |
| 3 |
| 8 |
| 1 |
| 7 |
=5
| 6 |
| 7 |
| 3 |
| 8 |
| 1 |
| 7 |
=(5
| 6 |
| 7 |
| 1 |
| 7 |
| 3 |
| 8 |
=6-
| 3 |
| 8 |
=5
| 2 |
| 8 |
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