题目内容

下面各题怎样简便怎样算.
7
18
×
1
4
+
3
4
×
7
18
(
1
4
-
1
6
)×12
15÷
9
10
×
3
5
3
5
÷4÷
1
12
40
13
×(26÷
40
3
)
1
8
÷(
1
6
+
3
4
2
5

(1)
7
18
×
1
4
+
3
4
×
7
18

=
7
18
×(
1
4
+
3
4
),
=
7
18
×1,
=
7
18


(2)(
1
4
-
1
6
)×12

=
1
4
×12-
1
6
×12,
=3-2,
=1;

(3)15÷
9
10
×
3
5

=15×
3
5
÷
9
10

=9÷
9
10

=10;

(4)
3
5
÷4÷
1
12

=
3
5
÷(4×
1
12
),
=
3
5
÷
1
3

=
9
5


(5)
40
13
×(26÷
40
3
)

=
40
13
×26÷
40
3

=
40
13
÷
40
3
×26,
=
3
13
×26,
=6;

(6)
1
8
÷(
1
6
+
3
4
2
5

=
1
8
÷
11
12
×
2
5

=
3
22
×
2
5

=
3
55
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