问题 解答题
计算下面各题,能简便的要用简便方法计算.
7
9
÷
1
27
÷
7
4
5
7
×6+
5
7
5
9
×
3
8
÷
5
36
3
4
-
5
7
)÷
1
56
4
9
-
7
16
×
4
9
(0.25+
5
16
×
12
5
)÷
3
5
5
13
÷7+
1
7
×
8
13
1
3
-
1
4
)÷
1
6
+
1
2
答案

(1)

7
9
÷
1
27
÷
7
4

=

7
9
×27×
4
7

=12;

(2)

5
7
×6+
5
7

=

5
7
×(6+1),

=

5
7
×7,

=5;

(3)

5
9
×
3
8
÷
5
36

=

5
9
×
3
8
×
36
5

=

3
2

(4)(

3
4
-
5
7
)÷
1
56

=(

3
4
-
5
7
)×56,

=

3
4
×56-
5
7
×56,

=42-40,

=2;

(5)

4
9
-
7
16
×
4
9

=(1-

7
16
)×
4
9

=

9
16
×
4
9

=

1
4

(6)(0.25+

5
16
×
12
5
)÷
3
5

=(

1
4
+
3
4
)×
5
3

=1×

5
3

=

5
3

(7)

5
13
÷7+
1
7
×
8
13

=

5
13
×
1
7
+
1
7
×
8
13

=

1
7
×(
5
13
+
8
13
),

=

1
7
×1,

=

1
7

(8)(

1
3
-
1
4
)÷
1
6
+
1
2

=

1
12
×6+
1
2

=

1
2
+
1
2

=1.

填空题
单项选择题