题目内容

2.5÷0.5=3.5÷0.01=0.2×50=0.2+0.78=8×2.5=1.5×4=
0.12×3=0.1-0.02=72.5÷0.8=42÷0.6=3×0.2×0.5=3.9÷5÷0.2=

解：2.5÷0.5=53.5÷0.01=3500.2×50=100.2+0.78=0.988×2.5=201.5×4=6
0.12×3=0.360.1-0.02=0.0872.5÷0.8=90.62542÷0.6=703×0.2×0.5=0.33.9÷5÷0.2=3.9

分析：根据小数除法、乘法、加法、减法的运算法则计算即可，3×0.2×0.5利用乘法结合律计算，3.9÷5÷0.2利用除法的性质计算．
点评：在完成小数乘除法时，要注意小数点位置的变化，完成小数加减法时，要注意小数点的对齐．
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相关题目
口算
（1）70×80=
5600
5600
        3.7×0.5=
1.85
1.85
     3.2×100=
320
320
      8.9-3.8=
5.1
5.1

（2）3.8+2.5+6.2=
12.5
12.5
    12-6.2-3.8=
2
2
   1.7+0.43+3.3=
5.43
5.43
    3.4-1.5-0.5=
1.4
1.4

（3）
8
9
+
1
9
--
2
7
=
5
7
5
7
     1.4×5=
7
7
    650-470=
180
180
    79+2.1=
81.1
81.1
    
（4）3.14×3=
9.42
9.42
      6.7+3.4=
10.1
10.1
   2.01×0.4=
0.804
0.804
   
6
13
+
7
13
=
1
1

（5）3.99+5.2=
9.19
9.19
   23+6.68=
29.68
29.68
   7×0.08=
0.56
0.56
    0.25×0.4=
0.1
0.1

（6）22×0.2=
4.4
4.4
   99.9+1=
100.9
100.9
   0.72÷6=
0.12
0.12
   3.9÷1.3=
3
3

（7）0.8×0.8=
0.64
0.64
   5.88+3.12=
9
9
   1.9+2.1=
4
4
   26÷2.6=
10
10
  
（8）340÷17=
20
20
   9.3÷0.3=
31
31
  13×4=
52
52
   3.6×5=
18
18

（9）1.5×4=
6
6
   20×16=
320
320
   28×3=
84
84
   3.2÷4=
0.8
0.8
 
（10）0.28×100=
28
28
   3200÷1000=
3.2
3.2
   0.5×100=
50
50
   4×0.125=
0.5
0.5

（11）340+120=
460
460
    
1
4
+
1
2
=
3
4
3
4
   2.5÷5=
0.5
0.5
   4.95×10=
49.5
49.5
   
（12）12-
1
2
-
1
2
=
11
11
   1÷0.25=
4
4
  5×0.13=
0.65
0.65
   12×0.05=
0.6
0.6

（13）3.08÷0.1=
30.8
30.8
   0.35×6=
2.1
2.1
   25÷0.5=
50
50
   1.5×3=
4.5
4.5

（14）4.3-2.7=
1.6
1.6
   8.1÷0.9=
9
9
   12÷1.2=
10
10
   0.48÷6=
0.08
0.08

（15）2.6÷26=
0.1
0.1
  0.72×5=
3.6
3.6
     4.8+3.2=
8
8
   5.7÷0.3=
19
19
．
1.23÷3= 0.8×11= 1-0.75=
1.7×0.4= 0.36÷12= 1.6+0.38=
1.2÷0.3= 0.75×4= 15×0.4=
2.14-0.9= 4×0.25= 10÷2.5=
0.4×52= 1.6×0.4= 9.6÷6=
4.3-0.4= 7-6.2= 0.86-0.3=
8.8÷2.2= 2.6÷0.2= 0.15×3=
0.9÷0.45= 0.27÷3= 0.51+1.7=
0.6÷0.5= 0.125×8= 0.38×1000=
6.8-1.7= 2.4×0.2= 32.8+19=
0.56÷14= 1÷0.05= 6÷12=
0.14×5= 3×1.4= 4.9÷0.7=
0.4÷8= 6.3+3.7= 3.5×0.2=
0.2×12.6×5= 8.4÷4.2= 2.4×0.5=
0÷3.5×0.2= 0×9.7+2.3= 1.6×9+1.6=
3.8+1.2= 4.8÷0.3= 530+270=
7.6÷3.8= 92÷2.3= 9.6-1.6=
7.2+2.8= 2.63+0.37= 0.67+1.24=
0.3×101=
 		 0.25×8=
 		 16÷1.6=
 
26.1-3.5-7.5=
 		    
直接写出得数．
2.5÷0.5= 3.5÷0.01= 0.2×50= 0.2+0.78= 8×2.5= 1.5×4=
0.12×3= 0.1-0.02= 72.5÷0.8= 42÷0.6= 3×0.2×0.5= 3.9÷5÷0.2=
下面各题怎样算简便就怎样算．
3.2+7.5×0.5
0.73×50×0.4
0.9×[13-（4.75+5.25）] 2.78+59.8+1.22
9.63×2.5+6.37×2.5 （12-1.5÷0.5）×4.2．
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=

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