试题与答案

计算下列各题(能简算的要简算)(23+215)×45 313×25+101

题型:解答题

题目:

计算下列各题(能简算的要简算)
2
3
+
2
15
)×45        
3
13
×
2
5
+
10
13
×0.8-0.8
0.25×
5
8
×4×1.6      
(1
1
2
+2.25)÷〔(3
1
3
-1
1
2
)÷1
2
9

答案:

(1)(

2
3
+
2
15
)×45,

=

2
3
×45+
2
15
×45,

=30+6,

=36;

(2)

3
13
×
2
5
+
10
13
×0.8-0.8,

=

3
13
×
2
5
+
10
13
×2×
2
5
-2×
2
5

=

2
5
×(
3
13
+
20
13
-2),

=

2
5
×(-
3
13
),

=-

6
65

(3)0.25×

5
8
×4×1.6,

=(0.25×4)×(

5
8
×1.6),

=1×1,

=1;

(4)(1

1
2
+2.25)÷[(3
1
3
-1
1
2
)÷1
2
9
],

=(1.5+2.25)÷[

11
6
×
9
11
],

=3.75÷

3
2

=3.75×

2
3

=2.5.

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