65×0.12+3.78     3.04×1.5-0.56    
52-1.6×2.4 8+1.5×0.4    
0.45×1.3×0.2     2.4×10.5
3.64×1.5+1.5×0.36     0.14×(6.45-0.37)
分析:(1)(4)先算乘法,再算加法;
(2)(3)先算乘法,再算減法;
(5)利用乘法交換律簡算;
(6)(7)利用乘法分配律簡算;
(8)先算減法,再算乘法.
解答:解:(1)65×0.12+3.78
=7.8+3.78
=11.58;

(2)3.04×1.5-0.56    
=4.56-0.56
=4;

(3)52-1.6×2.4
=52-3.84
=48.16;

(4)8+1.5×0.4  
=8+0.6
=8.6;

(5)0.45×1.3×0.2
=0.45×0.2×1.3
=0.09×1.3
=0.117;

(6)2.4×10.5
=2.4×10+2.4×0.5
=24+1.2
=25.2;

(7)3.64×1.5+1.5×0.36
=(3.64+0.36)×1.5
=4×1.5
=6;

(8)0.14×(6.45-0.37)
=0.14×6.08
=0.8512.
點(diǎn)評:混合運(yùn)算注意運(yùn)算順序,抓住數(shù)字特點(diǎn)與運(yùn)算符號,選用適當(dāng)?shù)倪\(yùn)算定律簡算.
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:

直接寫得數(shù).
698+560=
1200-909= 1.3+0.41= 500÷5÷20=
2.7-1.58= 2.5×0.4= 1.4÷3.5= 3.65+0.36×0=
452.4÷48.9≈ 201.2×39≈
3
4
-
2
3
=
6-
5
7
-
2
7
=
1.65+0.8= 3.6-0.36=
1
5
=
8.4+99×8.4=
7
8
×
1
7
=
1
9
÷
2
3
=
1
3
+
1
2
=
(
4
5
+
5
6
)×30
=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

直接寫出得數(shù).
12×5= 25×4= 125×8= 568÷100=
0.06×1000= 80×70= 35+65×0= 27÷3×8=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

7
10
÷
5
7
=
8
9
×
27
16
=
7
8
÷
7
8
=
6
5
×21-
6
5
=
37
25
=
3-1.8×
5
9
=
4
3
-(
1
2
+
1
3
)
=
1
3
×
3
4
÷
1
3
×
3
4
=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來源: 題型:

1、
1
6
+
1
8
=
1
25
÷
1
100
=
1
3
÷
1
4
=
5
6
÷
1
6
=
4
5
-
3
5
=
1
6
÷
5
6
=
5-
1
6
=
7
20
÷
1
4
=
1
6
+
1
5
=
3
5
×
1
6
=
1
2
×
4
5
=
1
6
×3=
1
2
×
2
5
=
1
4
-
1
5
=
5
8
-
1
4
=
9
10
-
9
20
=
2
3
÷
1
8
=
1
5
+
1
50
=
7
8
-
3
4
=
1
3
-
1
6
=
5
6
×
3
5
=
3
10
×135=
1
3
+
2
5
=
1
5
+
3
2
=
2
3
×
2
5
=
1
10
+
3
5
=
6
7
-
1
5
=
7
8
-
1
6
=
6
25
÷
1
5
=
9
80
-
1
10
=
18×
5
9
=
1
7
÷
1
4
=
1
10
÷
2
15
=
7
60
÷
1
30
=
1
7
÷
5
7
=
1
5
+
1
6
=
2.4×20= 0.12×3= 0.45×2= 3×1.5=
1.2÷0.3= 1÷2= 4.8×100= 4÷0.2=
0.25×8= 0.89÷8.9= 17.8+2.2= 4.2×5=
0.8÷0.2= 5.79÷0.1= 0.35+0.65= 3.4-1.5=
8.9-0.9= 9.2-9.2= 3.6÷0.4= 0.7×11=
15.15÷15= 0.2×0.3= 1.34×4×2.5= 0.9÷4.5=

查看答案和解析>>

同步練習(xí)冊答案