题目内容

能简算的要简算.
1
65
×
7
18
×65        

48×(
1
6
+
1
3
-
1
12
)       

13
3
×0.46+
13
3
×0.54           
4
5
×
3
8
×
5
9
8
3
+
3
2
)×6      
1
1×2
+
1
2×3
+
1
3×4
+…+
1
99×100
      
25
3
4
×4     
6
7
+
1
7
×
7
8
+
1
8
17
23
×
31
35
+
4
23
×
17
35
        
55×
4
5
-45×
4
5
          
97×
95
96
       
1999÷2000×2001
1
4
×99+
1
4
            
5-
11
12
+
3
11
-
3
4
            
37×
8
9
+62×
8
9
       
24
25
-
4
5
+
1
5
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)、(4)根据乘法交换律进行简算;
(2)、(3)、(5)、(7)、(9)、(10)、(11)、(12)、(13)、(15)根据乘法分配律进行简算;
(6)根据分数的拆项进行简算;
(8)先算乘法,再根据加法结合律进行简算;
(14)根据加法交换律和结合律进行简算;
(16)按照从左向右的顺序进行计算.
解答: 解:(1)
1
65
×
7
18
×65
=
1
65
×65×
7
18

=1×
7
18

=
7
18


(2)48×(
1
6
+
1
3
-
1
12

=48×
1
6
+48×
1
3
-48×
1
12

=8+16-4
=24-4
=20;


(3)
13
3
×0.46+
13
3
×0.54
=
13
3
×(0.46+0.54)
=
13
3
×1
=
13
3


(4)
4
5
×
3
8
×
5
9

=
4
5
×
5
9
×
3
8

=
4
9
×
3
8

=
1
6


(5)(
8
3
+
3
2
)×6
=
8
3
×6+
3
2
×6
=16+9
=25;

(6)
1
1×2
+
1
2×3
+
1
3×4
+…+
1
99×100

=(1-
1
2
)+(
1
2
-
1
3
)+(
1
3
-
1
4
)+…+(
1
99
-
1
100

=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+…+
1
99
-
1
100

=1-
1
100

=
99
100


(7)25
3
4
×4
=(25+
3
4
)×4
=25×4+
3
4
×4
=100+3
=103;

(8)
6
7
+
1
7
×
7
8
+
1
8

=
6
7
+
1
8
+
1
8

=
6
7
+(
1
8
+
1
8

=
6
7
+
1
4

=
31
28


(9)
17
23
×
31
35
+
4
23
×
17
35

=
17
23
×
31
35
+
4
35
×
17
23

=
17
23
×(
31
35
+
4
35

=
17
23
×1
=
17
23


(10)55×
4
5
-45×
4
5

=(55-45)×
4
5

=10×
4
5

=8;

(11)97×
95
96

=(96+1)×
95
96

=96×
95
96
+1×
95
96

=95+
95
96

=95
95
96


(12)1999÷2000×2001
=
1999
2000
×2001
=
1999
2000
×(2000+1)
=
1999
2000
×2000+
1999
2000
×1
=1999+
1999
2000

=1999
1999
2000


(13)
1
4
×99+
1
4

=
1
4
×(99+1)
=
1
4
×100
=25;

(14)5-
11
12
+
3
11
-
3
4

=(5+
3
11
)-(
11
12
+
3
4

=5
3
11
-1
2
3

=3
20
33


(15)37×
8
9
+62×
8
9

=(37+62)×
8
9

=99×
8
9

=88;

(16)
24
25
-
4
5
+
1
5

=
4
25
+
1
5

=
9
25
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网