题目内容

(2010?江都市模拟)计算,能简单的要简算
48×(
1
4
-
1
6
)  
7
8
-
13
4
-
3
4
+
33
8
   
632-486÷18+395
[
1
2
-(
1
18
+
4
9
)]÷
17
23
    
 0.75×74+
3
4
×25+75%   
1
2
+
1
4
+
1
8
+
1
16
+
1
32
+
1
64
分析:(1)运用乘法分配律解答,
(2)运用加法交换律,以及减法简便运算解答,
(3)先算第二级运算,再算第一级运算解答,
(4)根据四则运算顺序解答,
(5)运用乘法分配律解答,
(6)化
1
2
=1-
1
2
1
2
=
1
2
-
1
4
1
32
=
1
16
-
1
32
1
64
=
1
32
-
1
64
解答.
解答:解:(1)48×(
1
4
-
1
6
),
=48×
1
4
-48×
1
6

=12-8,
=4;

(2)
7
8
-
13
4
-
3
4
+
33
8

=(
7
8
+
33
8
)-(
13
4
+
3
4
),
=5-4,
=1;
 
(3)632-486÷18+395,
=632-27+395,
=605+395,
=1000;

(4)[
1
2
-(
1
18
+
4
9
)]÷
17
23

=[
1
2
-
1
2
]÷
17
23

=0÷
17
23

=0;
  
(5)0.75×74+
3
4
×25+75%,
=0.75×(74+25+1),
=0.75×100,
=75;

(6)
1
2
+
1
4
+
1
8
+
1
16
+
1
32
+
1
64

=1-
1
2
+
1
2
-
1
4
+…+
1
32
-
1
64

=1-
1
64

=
63
64
点评:本题主要考查学生对于四则运算顺序,以及四则运算简便算法的掌握.
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