0.125×32×25 128×99
32
3
-(3.14+
2
3
5
6
-
3
4
)÷
5
12
+
9
5
4
7
+
3
8
+
1
8
+
5
7
1
2
+
1
3
÷
2
3
10.9-1.6-3
2
5
1
4
÷(
4
3
-
1
2
4
25
÷
25
12
6.5×99+6.5
1
2
+
1
3
+
1
6
)×24
123×5.67+8.77×567
2-
7
15
×
9
14
2-
5
11
÷
9
22
-
8
9
3
4
÷(1-
1
2
-
3
8
49×
5
48
2
3
+
1
8
)×(1-
9
19
9
3
4
+99
3
4
+999
3
4
+9999
3
4
分析:(1)化32=8×4,再運用乘法結(jié)合律解答,
(2)(4)(10)(11)(12)(16)運用乘法分配律解答,
(3)(7)(14)依據(jù)減法的性質(zhì)解答,
(5)運用加法交換律和結(jié)合律解答,
(6)(8)(13)(15)(17)依據(jù)四則運算計算方法解答,
(9)運用除法的性質(zhì)解答,
(18)根據(jù)整數(shù)部分與整數(shù)部分,分數(shù)部分與分數(shù)部分相加解答.
解答:解:(1)0.125×32×25,
=(0.125×8)×(4×25),
=1×100,
=100;

(2)128×99,
=128×(100-1),
=128×100-128×1,
=12800-128,
=12672;

(3)
32
3
-(3.14+
2
3
),
=10
2
3
-3.14-
2
3

=10-3.14,
=6.86;

(4)(
5
6
-
3
4
)÷
5
12
+
9
5
,
=
5
6
÷
5
12
-
3
4
÷
5
12
+
9
5
,
=2-
9
5
+
9
5
,
=2;

(5)
4
7
+
3
8
+
1
8
+
5
7

=(
4
7
+
5
7
)+(
3
8
+
1
8
),
=
9
7
+
1
2
,
=1
11
14
;

(6)
1
2
+
1
3
÷
2
3
,
=
1
2
+
1
2
,
=1;

(7)10.9-1.6-3
2
5
,
=10.9-(1.6+3.4),
=10.9-5,
=5.9;

(8)
1
4
÷(
4
3
-
1
2
),
=
1
4
÷
5
6

=0.3;

(9)2÷
4
25
÷
25
12
,
=2÷(
4
25
×
25
12
),
=2÷
1
3

=6;

(10)6.5×99+6.5,
=6.5×(99+1),
=6.5×100,
=650;

(11)(
1
2
+
1
3
+
1
6
)×24,
=
1
2
×24+
1
3
×24+
1
6
×24,
=12+8+4,
=20+4,
=24;

(12)123×5.67+8.77×567,
=5.67×(123+877),
=5.67×1000,
=5670;

(13)2-
7
15
×
9
14
,
=2-0.3,
=1.7;

(14)2-
5
11
÷
9
22
-
8
9

=2-(
10
9
+
8
9
),
=2-2,
=0;

(15)
3
4
÷(1-
1
2
-
3
8
),
=
3
4
÷(
1
2
-
3
8
),
=
3
4
÷
1
8
,
=6;

(16)49×
5
48
,
=(48+1)×
5
48

=48×
5
48
+1×
5
48
,
=5+
5
48

=5
5
48
;

(17)(
2
3
+
1
8
)×(1-
9
19
),
=
19
24
×
10
19
,
=
5
12
;

(18)9
3
4
+99
3
4
+999
3
4
+9999
3
4
,
=(9+99+999+9999)+(
3
4
×4),
=9++(99+1)+(999+1)+(9999+1),
=9+100+1000+10000,
=11109.
點評:本題主要考查了學生運用四則運算計算方法,以及簡便算法解決問題的能力
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