问题 解答题
下列各题能简算的要简算.
3.1+2.4+1.9+3.6300-288÷2448×(
3
8
+
5
6
0.46×98+0.92
4
5
×
2
5
÷
4
5
×
2
5
21÷(
1
3
+
2
5
)÷
9
11
答案

(1)3.1+2.4+1.9+3.6,

=(3.1+1.9)+(2.4+3.6),

=5+6,

=11;

(2)300-288÷24,

=300-12,

=288;

(3)48×(

3
8
+
5
6
),

=48×

3
8
+48×
5
6

=18+40,

=58;

(4)0.46×98+0.92,

=0.46×(100-2)+0.92,

=0.46×100-0.46×2+0.92,

=46-0.92+0.92,

=46;

(5)

4
5
×
2
5
÷
4
5
×
2
5

=(

4
5
÷
4
5
)×(
2
5
×
2
5
),

=1×0.16,

=0.16;

(6)21÷(

1
3
+
2
5
)÷
9
11

=21÷

11
15
÷
9
11

=21÷(

11
15
×
9
11
),

=21÷

3
5

=35.

判断题
填空题