题目内容

9
14
×
3
8
÷
3
14
2
9
×
3
5
+
4
9
×
3
5
2.8×(
1
7
+
3
28
)
(
1
2
-
1
4
÷
5
8
)×
5
7
19
4
×
1
5
+
19
4
÷
5
4
+
19
4
.
(1)
9
14
×
3
8
÷
3
14
,
=
9
14
×
3
8
×
14
3
,
=1
1
8
;

(2)
2
9
×
3
5
+
4
9
×
3
5
,
=(
2
9
+
4
9
)×
3
5
,
=
2
3
×
3
5
,
=
2
5
;

(3)2.8×(
1
7
+
3
28
),
=2.8×
1
7
+
3
28
×2.8,
=0.4+0.3,
=0.7;

(4)(
1
2
-
1
4
÷
5
8
)×
5
7
,
=(
1
2
-
2
5
)×
5
7
,
=
1
10
×
5
7
,
=
1
14
;

(5)
19
4
×
1
5
+
19
4
÷
5
4
+
19
4
,
=
19
4
×
1
5
+
19
4
×
4
5
+
19
4
,
=
19
4
×(
1
5
+
4
5
+1
),
=9.5.
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