问题 解答题
下面各题,用你喜欢的方法计算.
12×(
5
6
-
2
4
)
1
2
÷
5
4
×
2
3
6÷(1-
2
3
)
8
13
×
1
7
+
1
7
×
5
13
19-
4
5
-
6
5
1
3
÷[
1
4
÷(
2
3
-
1
2
)]
答案

(1)12×(

5
6
-
2
4
),

=12×

5
6
-
2
4
×12,

=10-6,

=4;

(2)

1
2
÷
5
4
×
2
3

=

1
2
×
4
5
×
2
3

=

4
15

(3)6÷(1-

2
3
),

=6÷

1
3

=6×3,

=18;

(4)

8
13
×
1
7
+
1
7
×
5
13

=

1
7
×(
5
13
+
8
13
),

=

1
7
×1,

=

1
7

(5)19-

4
5
-
6
5

=19-(

4
5
+
6
5
),

=19-2,

=17;

(6)

1
3
÷[
1
4
÷(
2
3
-
1
2
)],

=

1
3
÷[
1
4
÷
1
6
],

=

1
3
÷[
1
4
×6],

=

1
3
÷
3
2

=

1
3
×
2
3

=

2
9

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