题目内容

简便计算
8
13
÷7+
1
7
×
6
13

4
17
×
5
9
+
13
9
×
5
17

1
2
+
2
3
+
3
4
)×12
5
11
+
5
7
×
4
11
(1)
8
13
÷7+
1
7
×
6
13

=(
8
13
+
6
13
)×
1
7

=
14
13
×
1
7

=
2
13


(2)
4
17
×
5
9
+
13
9
×
5
17

=
5
17
×
4
9
+
13
9
×
5
17

=
5
17
×
4
9
+
13
9
),
=
5
17
×
17
9

=
5
9


(3)(
1
2
+
2
3
+
3
4
)×12,
=
1
2
×
12+
2
3
×
12+
3
4
×
12,
=6+8+9,
=23;

(4)
5
11
+
5
7
×
4
11

=
5
11
+
4
7
×
5
11

=
5
11
×
4
7
+
1),
=
5
11
×
11
7

=
5
7
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