题目内容

计算下面各题:
(
1
4
+
7
20
)÷
3
4
=______;
11
18
×9-
11
18
×6=______;
13.6÷2-0.4×7=______;
2600-1600÷25÷4=______.
(
1
4
+
7
20
)÷
3
4
,
=(
1
4
+
7
20
)×
4
3
,
=
1
4
×
4
3
+
7
20
×
4
3
,
=
1
3
+
7
15
,
=
5
15
+
7
15
,
=
12
15
,
=
4
5
;

11
18
×9-
11
18
×6,
=
11
18
×(9-6),
=
11
18
×3,
=
11
6
;

13.6÷2-0.4×7,
=6.8-0.28,
=6.52;

2600-1600÷25÷4,
=2600-1600÷(25×4),
=2600-1600÷100,
=2600-16,
=2584.
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