1+
9
11
-( 
1
5
+
9
11
)      
3
4
-
3
16
+
1
4
4
7
+
2
9
+
3
7
+
7
9
            
1
2
-
1
7
-
1
4
5+
5
9
+
3
7
+
4
9
              
24-( 
5
9
+
7
12
 )
1
2
-
3
8
)÷
3
4
                  
3
5
÷[
1
8
×(1-
1
5
)]
5×(
1
15
+
3
10
)        
1
4
+
3
8
)]÷
3
4
        
4×48×25×
1
6
分析:(1)根據(jù)連減的性質(zhì)進行簡算;
(2)根據(jù)加法交換律進行簡算;
(3)根據(jù)加法交換律和結(jié)合律進行簡算;
(4)根據(jù)連減的性質(zhì)進行簡算;
(5)根據(jù)加法交換律和結(jié)合律進行簡算;
(6)先算加法,再算減法;
(7)先算減法,再算除法;
(8)先算減法,再算乘法,最后算除法;
(9)根據(jù)乘法分配律進行計算;
(10)先算加法,再算除法;
(11)根據(jù)乘法交換律和結(jié)合律進行簡算.
解答:解:
(1)1+
9
11
-( 
1
5
+
9
11
),
=1+
9
11
-
1
5
-
9
11
,
=(1-
1
5
)+(
9
11
-
9
11
),
=
4
5
;

(2)
3
4
-
3
16
+
1
4

=
3
4
+
1
4
-
3
16
,
=1-
3
16

=
13
16
;

(3)
4
7
+
2
9
+
3
7
+
7
9
,
=(
4
7
+
3
7
)+(
2
9
+
7
9
),
=1+1,
=2;

(4)
1
2
-
1
7
-
1
4
,
=
1
2
-(
1
7
+
1
4
),
=
1
2
-
11
28
,
=
3
28
;

(5)5+
5
9
+
3
7
+
4
9

=(5+
3
7
)+(
5
9
+
4
9
),
=5
3
7
+1,
=6
3
7
;

(6)24-(
5
9
+
7
12
),
=24-
41
36
,
=22
31
36
;

(7)(
1
2
-
3
8
)÷
3
4

=
1
8
÷
3
4
,
=
1
6


(8)
3
5
÷[
1
8
×(1-
1
5
)],
=
3
5
÷[
1
8
×
4
5
],
=
3
5
÷
1
10

=6;

(9)5×(
1
15
+
3
10
),
=5×
1
15
+5×
3
10
,
=
1
3
+
3
2
,
=
11
6
;

(10)(
1
4
+
3
8
)÷
3
4
,
=
5
8
÷
3
4
,
=
5
6


(11)4×48×25×
1
6
,
=(4×25)×(48×
1
6
),
=100×8,
=800.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算律簡便計算.
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