问题 解答题
用合适的方法计算.
1
2
÷
5
4
÷
2
15
5.2-11÷7-
1
7
×3
5
7
×
1
4
+
3
4
÷
7
5
5
8
÷(
1
2
+
1
4
1
4
+
1
6
-
1
3
)÷
1
12
5
7
÷[1÷(
2
3
-
1
5
)].
答案

(1)

1
2
÷
5
4
÷
2
15

=

1
2
×
4
5
×
15
2

=

2
5
×
15
2

=3;

(2)5.2-11÷7-

1
7
×3,

=5.2-

11
7
-
3
7

=5.2-(

11
7
+
3
7
),

=5.2-2,

=3.2;

(3)

5
7
×
1
4
+
3
4
÷
7
5

=

5
7
×
1
4
+
3
4
×
5
7

=

5
7
×(
1
4
+
3
4
),

=

5
7
×1,

=

5
7

(4)

5
8
÷(
1
2
+
1
4
),

=

5
8
÷
3
4

=

5
6

(5)(

1
4
+
1
6
-
1
3
)÷
1
12

=(

1
4
+
1
6
-
1
3
)×12,

=

1
4
×12+
1
6
×12-
1
3
×12,

=3+2-4,

=1;

(6)

5
7
÷[1÷(
2
3
-
1
5
)],

=

5
7
÷[1÷
7
15
],

=

5
7
÷
15
7

=

1
3

选择题
单项选择题