口算
(1)12÷
1
2
=
(2)1÷1%= (3)9.5+0.5= (4)
1
3
+
1
4
=
(5)0÷
1
5
×2=
(6)1-
11
12
=
(7)
7
8
×
5
14
=
(8)
7
12
÷
7
4
=
(9)
4
5
-
1
2
=
(10)
1
9
×
7
8
×9=
分析:分?jǐn)?shù)乘法:分子相乘的積做分子,分母相乘的積做分母;
分?jǐn)?shù)除法:除以一個數(shù)等于乘這個數(shù)的倒數(shù);
異分母分?jǐn)?shù)相加減,分母不變,分子相加減.
(10)運用乘法交換律簡算.
解答:
解:(1)12÷
1
2
=24,
(2)1÷1%=100, (3)9.5+0.5=10, (4)
1
3
+
1
4
=
7
12
,
(5)0÷
1
5
×2=0,
(6)1-
11
12
=
1
12
,
(7)
7
8
×
5
14
=
5
16
,
(8)
7
12
÷
7
4
=
1
3
,
(9)
4
5
-
1
2
=
3
10
,
(10)
1
9
×
7
8
×9=
7
8
點評:本題考查了簡單分?jǐn)?shù)的計算,注意把結(jié)果化成最簡分?jǐn)?shù).
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:小學(xué)數(shù)學(xué) 來源: 題型:

(2011?江安縣模擬)
口算.
5
7
=
4.8÷2.4= 9600÷30= 84%÷4=
52×0.4= 21.7÷0.7=
1
3
-
1
6
=
1
4
+
3
8
=
b×0= 0.73×99+0.73= 84÷0.7= 2+1÷3=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

口算
3.2×0.2             
1.4×0.4           3.3÷3          1.2÷0.3
2.5×0.4             1.5×2            0.7×7           7.3+0.3
0.53-0.3             1.8×0.5           0.9×0.01        0.23×3
(5)2-1.2               7.8÷6             8.4÷0.21         8.4÷0.7
5.6+3.6            9-2.35              0.56÷8         1.23×3
5.6÷0.4            4.5÷0.9            8.1×2          90÷3
1.23+3             5.6+1.23           4.5×2          5.6÷1.4
4.8÷1.2           7.2÷0.9           6.6÷1.1          7.2÷6
2.1÷3             0.6×0.5           3.23×2          1.8÷3
12.5÷0.1          0.32÷0.8          1.6+3.7           0.45×0.2
0.36÷1.8          0.4×0.5            8.4+5.6         8.4÷2.1
4.8÷0.08          4.8÷0.8            3+2.3           9.3÷3
0.01×8           7.31×100          0.09×6         0.8×0.6
1.25×8            3÷5               2.3+2.3         6.23+3.6

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

口算.
1.3×6=
1.2×9= 2.5×4= 7×1.2= 6×2.1=
3×4.8= 2.3×8= 1.5×8= 3.2×3= 4×2.2=
5×2.6= 7×1.7= 1.5×4= 2.4×3= 1.8×4=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

口算:
26.26÷26=
4.57+6.43= 7.9×11-7.9= 3.14×32=
3+
3
4
-3+
3
4
=
0.1×30%= 2÷1%-2=
3
4
÷
3
8
=
1.8×4×0.5= 1.5-1.5×0.3= 5.7+4.3= 1-25%=
18×
2
9
=
6
7
×
7
9
=
3.6÷12= 18÷
2
9
=
11
12
÷22=
5
8
÷5=
3
10
÷1=
1-0.6=
0.92-0.2= 0.52+0.4= 0.72÷0.9= 0÷0.24=
3.3÷0.1= 1÷0.25= 0.6×5= 0.2×0.4=
0.25×36=
3
8
×3=
3
4
×12=
4
7
=
1
2
÷
2
3
=
4
5
÷
6
5
=
10÷
2
5
=
3.5+47=
0.4×12×25= 10×
2
5
=
260-48-52= 3.6÷12=
18÷
2
9
=
5.7+4.3= 0.25×36=
3
8
×3=
0.4×12×25=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源:數(shù)學(xué)教研室 題型:039

口算.

(1)0.1÷0.01=

(2)8.4÷4.2=

(3)3.5×0.1=

(4)0.35×0.2=

(5)0.84÷0.7=

(6)82.84=

(7)0.321.68=

(8)1.25×0.8=

(9)6.6÷0.66=

(10)1.2÷0.2=

(11)0.5×0.8=

(12)0.05×100=

查看答案和解析>>

同步練習(xí)冊答案