题目内容

8
21
÷
8
7
-
7
8
×
5
21

25%×
8
13
+
5
13
×
1
4

12×(
1
2
+
3
4
)
.
8
21
÷
8
7
-
7
8
×
5
21
,
=
8
21
×
7
8
-
7
8
×
5
21
,
=(
8
21
-
5
21
)×
7
8
,
=
3
21
×
7
8
,
=
1
8
;

25%×
8
13
+
5
13
×
1
4
,
=
1
4
×
8
13
+
5
13
×
1
4
,
=
1
4
×
(
8
13
+
5
13
),
=
1
4
×1
,
=
1
4
;

12×(
1
2
+
3
4
)
.
=12×
1
2
+12×
3
4
,
=6+9,
=15.
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