题目内容

简便计算.(要写出主要简便过程)
11
13
×
3
8
+
5
8
×
11
13

1
4
×
3
7
+
4
7
÷4

17
18
×
9
10
+
17
18
÷10
(1)
11
13
×
3
8
+
5
8
×
11
13

=(
3
8
+
5
8
)×
11
13

=1×
11
13

=
11
13


(2)
1
4
×
3
7
+
4
7
÷4

=
1
4
×
3
7
+
4
7
×
1
4

=
1
4
×(
3
7
+
4
7

=
1
4
×1
=
1
4


(3)
17
18
×
9
10
+
17
18
÷10

=
17
18
×
9
10
+
17
18
×
1
10

=
17
18
×(
9
10
+
1
10

=
17
18
×1
=
17
18
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