题目内容

7
25
×103-
7
25
×2-
7
25

7
2
17
+(
5
18
-
2
17

5
6
7
-(
3
8
-
1
7
(1)
7
25
×103-
7
25
×2-
7
25

=
7
25
×(103-2-1),
=
7
25
×100,
=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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