四年级下册数学试题简便运算含答案文档格式.docx
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四年级下册数学试题简便运算含答案文档格式.docx
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c)
5.乘法分配律:
两个数的和与一个数相乘,可以先把它们与这个数分别相乘,再相加。
a×
(b+c)=a×
b+a×
c
知识点一·
加法交换律
例题1357+288+143
练习1158+395+142
知识点二·
加法结合律
例题2169+78+22
练习158+39+42+61
练习2138+293+62+107
知识点三·
乘法交换律
例题3125×
(12×
4)
练习125×
17×
4
知识点四·
乘法结合律
例题442×
125×
8
练习138×
25×
4
练习225×
知识点五·
乘法分配律
例题5(80+4)×
25
练习1(20+4)×
25
练习215×
(20+3)
基础演练
(25×
125)×
(8×
4)49×
4×
538×
8×
3
(125×
25)×
45×
289×
2(125×
12)×
64125×
8844×
357+288+143158+395+105167+289+33
378+527+73
巩固提高
(1)75×
45+17×
25
(2)599996+49997+3998+407+89
(3)(48×
75×
81)÷
(24×
25×
27)(4)137÷
4÷
(5)5600÷
(25×
7)(6)210÷
42×
6
1)67×
21+18×
21+85×
792)321×
81+321×
19
3)222222×
9999994)333333×
333333
5)56000÷
(14000÷
16)6)654321×
909090+654321×
90909
_________________________________________________________________________________
38×
29+3875×
299+7564×
199+64
125×
(17×
8)×
4375×
480+6250×
48
25×
16×
12513×
99
75000÷
125÷
157900÷
4÷
25
参考答案
=357+143+288
=500+288
=788
=158+142+395
=300+395
=695
=169+(78+22)
=169+100
=269
=(58+42)+(39+61)
=100+100
=200
=(138+62)+(293+107)
=200+400
=600
=125×
48
6
=1000×
=6000
=25×
17
=100×
=1700
=42×
(125×
8)
1000
=4200
=38×
100
=3800
=80×
25+4×
=2000+100
=2100
=20×
25+4×
=500+100
=600
=15×
20+15×
=300+45
=345
=(125×
8)×
4)=49×
(4×
5)=38×
3×
=1000×
100=49×
20=114×
=10000=980=114000
=125×
4)=289×
(5×
2)=125×
12
=125×
100=289×
10=1000×
=12500=2890=12000
8=125×
11=11×
8=1000×
=8000=11000=1100
=357+143+288=158+(395+105)=167+33+289
=500+288=158+500=200+289
=788=658=489
378+527+73169+78+2258+39+42+61138+293+62+107
=378+(527+73)=169+(78+22)=(58+42)+(39+61)=(138+62)+(293+107)
=378+600=169+100=100+100=200+400
=978=269=200=600
=25×
45+17×
25=600000+50000+4000-4-3-2+407+89
(135+17)=65400+487
152=65887
38
=3800
27)(4)13700÷
=48÷
24×
75÷
81÷
27=13700÷
25)
=2×
3=13700÷
=18=137
=56×
100÷
25÷
7=210÷
7÷
6×
=56÷
7×
25=30
=32
=21×
(67+18)+85×
79=321×
(81+19)
85+85×
79=32100
=85×
(21+79)
=8500
=222222×
(1000000-1)=111111×
999999
=0000-222222=111111×
(1000000-1)
=7778=-111111
=
=56000÷
14000×
16=654321×
999999
=4×
16=654321×
(100000-1)
=64=0000-654321
=5679
=38×
29+38×
1=75×
299+75×
1=64×
199+64×
1
(29+1)=75×
(299+1)=64×
(199+1)
30=75×
300=64×
200
=1140=22500=12800
=125×
17=480×
(375+625)
68=480000
=68000
2×
125=13×
(100-1)
=50000=1300-13
=1287
=75×
1000÷
125÷
15=7900÷
=75÷
15×
125=79
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