问题 解答题
脱式计算,能简算的要简算.
4
9
×0.875×
9
2
3
4
÷[(
1
3
+
1
2
)×12]
6
13
×
2
7
+
8
13
×
2
7
4-
9
15
÷
9
5
-
2
3
答案

(1)

4
9
×0.875×
9
2

=

4
9
×
9
2
×0.875,

=2×0.875,

=1.75;

(2)

3
4
÷[(
1
3
+
1
2
)×12],

=

3
4
÷[
1
3
×12+
1
2
×12],

=

3
4
÷[4+6],

=

3
4
÷10,

=

3
40

(3)

6
13
×
2
7
+
8
13
×
2
7

=(

6
13
+
8
13
)×
2
7

=

14
13
×
2
7

=

4
13

(4)4-

9
15
÷
9
5
-
2
3

=4-

1
3
-
2
3

=4-(

1
3
+
2
3
),

=4-1,

=3.

单项选择题
单项选择题