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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