问题 解答题
脱式计算.(能简算的要简算)
3
8
+
4
9
+
5
8
+
5
9
12.04-5.37-4.63
4
5
+
1
6
+
4
15
)×30;
1
8
×[
1
2
÷(
3
5
×
10
9
)]
32×71.1+28.9×32
1
2
+
1
4
)÷(
4
5
÷4-
1
10
答案

(1)

3
8
+
4
9
+
5
8
+
5
9

=(

3
8
+
5
8
)+(
4
9
+
5
9
),

=1+1,

=2;

(2)12.04-5.37-4.63,

=12.04-(5.37+4.63),

=12.04-10,

=2.04;

(3)(

4
5
+
1
6
+
4
15
)×30,

=

4
5
×30+
1
6
×30+
4
15
×30,

=24+5+8,

=29+8,

=37;

(4)

1
8
×[
1
2
÷(
3
5
×
10
9
)],

=

1
8
×[
1
2
÷
2
3
],

=

1
8
×
3
4

=

3
32

(5)32×71.1+28.9×32,

=(71.1+28.9)×32,

=100×32,

=3200;

(6)(

1
2
+
1
4
)÷(
4
5
÷4-
1
10
),

=

3
4
÷(
1
5
-
1
10
),

=

3
4
÷
1
10

=7.5.

单项选择题
单项选择题