精英家教网 > 小学数学 > 题目详情
25×3.2×1.25.
分析:在计算时,把3.2看作4×0.8,运用乘法结合律简算.
解答:解:25×3.2×1.25,
=25×4×(0.8×1.25),
=100×1,
=100.
点评:简便计算主要是运用所学性质与定律以及数与数之间的特殊关系灵活进行,因此要对学过的定律或性质熟练掌握,恰当运用.
练习册系列答案
相关习题

科目:小学数学 来源: 题型:

(2012?中山模拟)
直接写出得数
(1)40×
5
8
=
(2)
7
8
-
1
4
=
(3)
2
3
×
6
7
=
(4)
2
5
÷10=
(5)
5
6
-1÷6=
(6)4.8÷12%= (7)39+26= (8)0.32=
(9)3-2.7= (10)52= (11)0.54÷0.9= (12)1-4%=
(13)280÷35= (14)5.4÷0.27= (15)
3
4
×
8
9
=
(16)30×10%-0.3=
(17)12×4÷12×4= (18)2
2
5
+0.6=
(19)383-98= (20)26.26÷26=
(21)4.57+6.43= (22)3.14×32= (23)7.9×11-7.9= (24)0.1×30%=
(25)2÷1%-2= (26)3.6÷0.036= (27)7÷19= (28)3.7×0.1%=
(29)0.99×9+0.99= (30)100×0.1%=

查看答案和解析>>

科目:小学数学 来源: 题型:

3.2+4.8= 6.3-0.94= 0.25×4= 5×1.2=
4.8÷0.6= 4.8÷24= 3.6-2.4= 6-4.6=
8-3.4= 6×0.21= 1.25×8= 0.8÷0.5=
25×0.3= 0.63-0.3= 2.5+7.5= 34×0.1=
7-0.99= 21÷0.7= 5×2.4= 3×1.03=
3.2÷4= 1.5÷30= 5.1÷3= 0.37÷0.37=
0.28÷14= 0.16÷4= 8×0.05= 4×0.125=
4÷8= 7.5-0.7= 9-0.9= 7÷2=
2.8÷0.7= 21-0.21= 5÷0.01= 2.8×0=
7÷0.07= 6.3÷0.5= 0.32÷0.8= 1÷0.25=
0.25×0.4= 30×2.3= 3.6÷1.2= 2.5+1.2=
3.5×0.2= 9÷0.45= 0.96÷0.16= 4.8-2.9=
0.5÷0.25= 7.6+2.4= 0.17×0.4= 8.2×0.01=
1.72-0.73= 0.46÷2= 1.9×0.8= 1.2×0.3=
1-0.92= 0.16×0.7= 0.56÷0.16= 8÷0.6=

查看答案和解析>>

科目:小学数学 来源: 题型:阅读理解

4.7+2.3= 4.5×2= 6.9-2.5= 7.2×0.8=
6×3.4= 0.62-0.32= 1.4×0.5= 0.75×100=
0.02×0.5= 3.6÷0.3= 6.3÷7= 5.6÷100=
0.75÷0.25= 0.125×8= 4.8÷0.3= 0.96÷2=
0.56÷28= 0.36÷0.4= 0.64÷0.8= 0.72÷3.6=
3.6÷24= 0.8×1.1= 7.2+12.8= 46.7-3.8=
12.8÷4= 5.2÷13= 12.5÷5= 1.64÷41=
10÷20= 24÷15= 8.65×10= 0.35×0.6=
3.08×0.01= 4.95×1000= 6.9×0.1= 0.4×0.5=
2.4÷0.8= 10.8÷9= 9.6÷0.8= 0.108÷2=
4.95÷0.9= 9.65÷0.1= 0.325×100= 2.5×8=
0.56÷0.7= 0.125×4= 3.28×0.1= 3.9÷0.13=
7.2×0.1= 0.01×0.1= 0.25×0.4= 1.6÷0.8=
1÷2.5= 1.25×0.8= 3.2÷0.04= 0÷1.7=
0.22×102= 9.6÷0.8= 5×0.24= 4.5-0.05=
3.9÷0.13 16.5÷0.5= 5×0.12= 24×0.5=
4.8×0.5= 2.8+4.2= 0.84÷2.1= 5÷0.25=
7.8÷0.01= 5.4÷0.6= 3.2÷5= 7×0.62=
0.56÷0.8= 7.4-2.8= 0.18÷0.2= 0.16÷8=
4.5×0.02= 8+7.2= 1.2×30= 0.012×0.2=
7.3×0.3= 9÷6= 3.6÷0.12= 7.8÷0.6=
2÷5= 4.5+5= 0.3÷0.6= 0.96÷0.2=
10.5×0.4= 7.3+0.27= 8×0.125= 0.54÷0.6=
0.61+0.39= 0.56÷28= 10÷20= 4.08÷0.4=
11-9.4= 0.8×0.11= 0.72+12.8= 5.6÷0.01=
2.3×100= 0.75×100= 0.108÷2= 10.8÷9=
0.7÷0.8= 16-5.07= 4.2×0.4= 0.72×6=
12÷0.5= 5.2×0.4= 12.2÷0.2= 5.6÷100=
0.41+3.7= 0.02×0.5= 7.2-0.8= 1.4×0.5=
84÷0.21= 0.75÷0.25= 2.5×16= 0.108÷2=
1.75+32.5= 16-5.07= 5.2÷13= 1.64÷41=
1.02×0.2= 0.26×0.3= 8.4×0.02= 1.29×6=
0.8×0.05= 12.6÷0.03= 8.71÷0.1= 21÷0.21=
0.8×0.13= 0.34÷17= 8.08÷0.4= 0.5×2.2=
1.24÷4= 3.27+0.63= 5.02×0.3= 0.3×0.5=
6.4÷4= 7.2÷1.8= 0.7÷0.35= 0.72÷1.44=
0.48÷0.04= 1.25÷2.5= 5.5+55= 16.8÷8=
0.54+2.2= 3.5-0.05= 2÷0.02= 0.25×40=
1.5×0.6= 0.32÷0.8= 12.25÷0.5= 73.5×0.1=
46.5+52.5= 0.45×102= 1.25×88= 2.64+3.85+1.54=
8×1.25= 5.6÷3.5= 4.2÷0.7÷6= 0.4×8.6×25=
0.27÷0.3= 2.5×101= 0.65×101-0.65= 2.6×7÷2.6×7=

查看答案和解析>>

科目:小学数学 来源: 题型:解答题

3.2+4.8=6.3-0.94=0.25×4=5×1.2=
4.8÷0.6=4.8÷24=3.6-2.4=6-4.6=
8-3.4=6×0.21=1.25×8=0.8÷0.5=
25×0.3=0.63-0.3=2.5+7.5=34×0.1=
7-0.99=21÷0.7=5×2.4=3×1.03=
3.2÷4=1.5÷30=5.1÷3=0.37÷0.37=
0.28÷14=0.16÷4=8×0.05=4×0.125=
4÷8=7.5-0.7=9-0.9=7÷2=
2.8÷0.7=21-0.21=5÷0.01=2.8×0=
7÷0.07=6.3÷0.5=0.32÷0.8=1÷0.25=
0.25×0.4=30×2.3=3.6÷1.2=2.5+1.2=
3.5×0.2=9÷0.45=0.96÷0.16=4.8-2.9=
0.5÷0.25=7.6+2.4=0.17×0.4=8.2×0.01=
1.72-0.73=0.46÷2=1.9×0.8=1.2×0.3=
1-0.92=0.16×0.7=0.56÷0.16=8÷0.6=

查看答案和解析>>

科目:小学数学 来源:专项题 题型:填空题

比一比,在○里填上“>”“<”或“=”。
(1)716 ×0.25○716÷4  (2)○8.677 (3)5.4 × 0. 9 ○0.9 × 5.4 
(4)0. 728÷ 0.9○0.728 (5) (6) 2.5 ×2 ×0.2○2.5 ×0.2 ×2
(7)2.5 ×3 ×4○0.5 ×6 ×10                         (8)1.3○1.3334 (9)1.2 +1.2 +1.2 ○1.2 ×1.2×1.2
(10)4(2.5 + a )○4 ×2.5 +4 a (11)5.6÷0.5○5.6×2
(12)3. 69 × 0.17○3. 69 +0.17

查看答案和解析>>

同步练习册答案