问题 解答题
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=______.
答案

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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