题目内容

1
2
+
5
7
×
7
10
1
2
+
8
3
÷
2
9
18×(3-
2
9
)
12×
3
4
+12×
1
4
1
7
+
3
8
+
6
7
+
5
8
5
4
×
1
9
+
3
4
÷9.
(1)
1
2
+
5
7
×
7
10
,
=
1
2
+
1
2
,
=1;

(2)
1
2
+
8
3
÷
2
9
,
=
1
2
+
8
3
×
9
2
,
=
1
2
+12,
=12
1
2
;

(3)18×(3-
2
9
),
=18×3-18×
2
9
,
=54-4,
=50;

(4)12×
3
4
+12×
1
4
,
=12×(
3
4
+
1
4
),
=12×1,
=12;

(5)
1
7
+
3
8
+
6
7
+
5
8
,
=(
1
7
+
6
7
)+(
3
8
+
5
8
),
=1+1,
=2;

(6)
5
4
×
1
9
+
3
4
÷9,
=
5
4
×
1
9
+
3
4
×
1
9
,
=(
5
4
+
3
4
)×
1
9
,
=2×
1
9
,
=
2
9
.
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