题目内容

5
8
×(
4
5
+16)
           
 (
5
6
+
3
4
8
3
               
7
11
÷[
2
5
-(1-
7
10
)]
        
6
7
+
2
7
÷
2
7
+
6
7
7
6
-
7
6
×
1
4
                
6
5
+
6
5
×
5
6
÷
1
5
           
5
11
÷11+
1
11
×
6
11
         
3
4
-
3
4
÷4
分析:(1)(5)运用乘法分配律简算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的除法;
(4)先算除法,再运用加法交换律简算;
(6)先算乘法,再算除法,最后算加法;
(7)先把除法变成乘法,再运用乘法分配律简算;
(8)先同时运算除法,再算减法.
解答:解:(1)
5
8
×(
4
5
+16)
     
=
5
8
×
4
5
+
5
8
×16
=
1
2
+10
=10
1
2


(2)(
5
6
+
3
4
8
3
         
=
19
12
×
3
8

=
19
32


(3)
7
11
÷[
2
5
-(1-
7
10
)]
=
7
11
÷[
2
5
-
3
10
]
=
7
11
÷
1
10

=
70
11


(4)
6
7
+
2
7
÷
2
7
+
6
7

=
6
7
+1+
6
7

=
6
7
+
6
7
+1
=1
5
7
+1
=2
5
7


(5)
7
6
-
7
6
×
1
4

=
7
6
×(1-
1
4

=
7
6
×
3
4

=
7
8


(6)
6
5
+
6
5
×
5
6
÷
1
5
  
=
6
5
+1÷
1
5

=
6
5
+5
=6
1
5


(7)
5
11
÷11+
1
11
×
6
11
      
=
5
11
×
1
11
+
1
11
×
6
11

=(
5
11
+
6
11
)×
1
11

=1×
1
11

=
1
11


(8)
3
4
-
3
4
÷4

=
16
3
-
3
16

=
247
48
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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