1125-997= 998+1246+9989= (8700+870+87)÷87= 125×8.8=
1.3+4.25+3.7+3.75= 17.15-(3.5-2.85)= 3.4×99+3.4= 4.8×1.01=
0.4×(2.5÷73)= (1.6+1.6+1.6+1.6)×25       
4
9
+
5
6
-
7
18
)÷
1
36
=
7
25
×100
1
7
=
12.3-2.45-5.7-4.55=
7
9
÷2
1
5
+
5
11
×
2
9
=
0.125×0.25×64= 64.2×87+0.642×1300=
78×36+7.8×741-7
4
5
=
13
21
×17+
17
12
×8=
7
8
×
1
2
+0.125×
1
2
+0.5=
2.42÷
3
4
+4.58×1
1
3
-4÷3=
25÷100
25
26
=
4.25-3
5
6
-(2
1
6
-1
3
4
)=
3.8÷3.9+3.9÷0.1+0.1÷3.9= 12.1-(
1
15
+
1
21
)×105=
分析:根據(jù)小數(shù)、分數(shù)、整數(shù)四則混合運算的順序進行計算解答.
解答:解:(1)1125-997,
=1125-1000+3,
=125+3,
=128;
(2)998+1246+9989,
=998+(1233+2+11)+9989,
=(998+2)+1233+(11+9989),
=1000+1233+10000,
=12233;
(3)(8700+870+87)÷87,
=8700÷87+870÷87+87÷87,
=100+10+1,
=111;
(4)125×8.8,
=125×8+125×0.8,
=1000+100,
=1100;
(5)1.3+4.25+3.7+3.75,
=(1.3+3.7)+(4.25+3.75),
=5+8,
=13;
(6)17.15-(3.5-2.85)
=17.15+2.85-3.5,
=20-3.5,
=16.5;
(7)3.4×99+3.4,
=3.4×(99+1),
=3.4×100,
=340;
(8)4.8×1.01,
=4.8×1+4.8×0.01,
=4.8+0.048,
=4.848;
(9)0.4×(2.5÷73),
=0.4×2.5÷73,
=1÷73,
=
1
73

(10)(1.6+1.6+1.6+1.6)×25,
=1.6×(4×25 ),
=1.6×100,
=160; 
(11)(
4
9
+
5
6
-
7
18
)÷
1
36

=
4
9
×36+
5
6
×36-
7
18
×36,
=16+30-14,
=32;
(12)
7
25
×100
1
7
,
=
7
25
×100+
7
25
×
1
7
,
=28+
1
25
,
=28
1
25

(13)12.3-2.45-5.7-4.55,
=(12.3-5.7)-(2.45+4.55),
=6.6-7,
=-0.4;
(14)
7
9
÷2
1
5
+
5
11
×
2
9
,
=
7
9
×
5
11
+
5
11
×
2
9
,
=(
7
9
+
2
9
)×
5
11
,
=1×
5
11
,
=
5
11
;
(15)0.125×0.25×64,
=(0.125×8)×(0.25×8),
=1×2,
=2;
(16)64.2×87+0.642×1300,
=64.2×(87+13),
=64.2×100,
=6420;
(17)78×36+7.8×741-7
4
5

=7.8×(360+741-1),
=7.8×1100,
=8580;
(18)
13
21
×17+
17
12
×8,
=
13
21
×17+
14
21
×17,
=(
13
21
+
14
21
)×17,
=
27
21
×17,
=
9
7
×17,
=
153
7
;
(19)
7
8
×
1
2
+0.125×
1
2
+0.5,
=(0.875+0.125+1)×0.5,
=(1+1)×0.5,
=2×0.5,
=1;
(20)2.42÷
3
4
+4.58×1
1
3
-4÷3,
=(2.42+4.58-1)×
4
3
,
=6×
4
3
,
=8;
(21)25÷100
25
26

=25÷
2625
26
,
=25×
26
2625

=
26
105
;
(22)4.25-3
5
6
-(2
1
6
-1
3
4
),
=(4.25+1.75)-(3
5
6
+2
1
6
),
=6-6,
=0;
(23)3.8÷3.9+3.9÷0.1+0.1÷3.9,
=(3.8+0.1)÷3.9+3.9÷0.1,
=3.9÷3.9+39,
=1+39,
=40;
(24)12.1-(
1
15
+
1
21
)×105,
=12.1-(
1
15
×105+
1
21
×105),
=12.1-(7+5),
=12.1-12,
=0.1.
點評:本題主要考查小數(shù)、分數(shù)、整數(shù)四則混合運算,注意運用運算定律進行簡算.
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