题目内容

用自己喜欢的方法计算,□中填入适当的数后使计算简便.
5
8
÷
3
4
×
9
25
=

4
9
÷(
1
3
+
1
6
3
4
=
2
7
×
8
13
+□×
8
13
=
5
6
×
1
17
+
1
6
÷
□=
(1)
5
8
÷
3
4
×
9
25

=
5
6
×
9
25

=
3
10


(2)
4
9
÷(
1
3
+
1
6
3
4

=
4
9
÷
1
2
×
3
4

=
8
9
×
3
4

=
2
3


(3)
2
7
×
8
13
+□×
8
13
要使本题计算简便,□中应填
5
7

2
7
×
8
13
+
5
7
×
8
13

=(
2
7
+
5
7
)×
8
13

=1×
8
13

=
8
13


(4)
5
6
×
1
17
+
1
6
÷
□要使本题计算简便,□应填17.
5
6
×
1
17
+
1
6
÷
17,
=
5
6
×
1
17
+
1
6
×
1
17

=(
5
6
+
1
6
)×
1
17

=1×
1
17

=
1
17
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