问题 解答题
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
答案

(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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