题目内容

2+0=9×0=0×5=0+6=0×7=4+0=
0+8=8-0=4×0=312×0=0+0=0×3=

解：
2+0=29×0=00×5=00+6=60×7=04+0=4
0+8=88-0=84×0=0312×0=00+0=00×3=0

分析：运用整数四则运算的计算法则进行口算，认真口算即可．
点评：此题考查了0参与计算的特性，0乘任何数都得0，任何数与0相加减仍得原数．
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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
．
口算
9.5×100=		 1.25×8 0.25×0.9×4= 1.87×0=
3.5-1.5= 1.2×0.4= 3.6×0.5= 0.6×5=
0.24+0.6= 0.64×0.03= 7.8+2.2-1.5= 8×0.05=
0.125×8= 1.3×4= 0.4×0.6= 3×0.08=
0.35×2= 2.9×0.3= 10-0.9= 5.67×0=
0.8×0.01= 2.5×0.2= 2.4×0.3= 1.6×0.25=
0.17×0.3= 15×0.01= 10×0.07= 0.7×0.05=
0.2×0.05= 7.8×0.01= 0.2×0.26= 0.04×4=
12.4+2.1= 0.08×0.5= 0.14×4= 9×2.5+9×1.5=
1.8×0.5= 2.3×5= 0.3×3.6= 8×0.9+8×2.1=
2.5×4= 0.8+2.7×2= 0.05×7= 4.8+2.1+7.9=
3.4-1.8= 2.5+0.2×2= 0.02×0.1= 5.4-2.8=
0.3×0.2= 3.5×2×0.1= 0.3×0.3= 0×10.3×2.2=
0.12×0.7= 0.2×0.5= 0.92×0.4= 6.7-1.43=
1.2×4= 1.3×2= 1.2×0.3= 4.6+5.08=
2+0= 9×0= 0×5= 0+6= 0×7= 4+0=
0+8= 8-0= 4×0= 312×0= 0+0= 0×3=
180÷60= 12×25= 0÷90=
4×5÷4×5= 0.25×4+4= 131+218+269+182=
25×6×4= 420÷35= 36×5×4=
120÷5÷3= 198-75-25= 120-20÷5=
59亿-58亿= （1.3+3.5）÷0.6= 75÷2.5=
0.45÷1.25÷8= 2.5×7.6×4= 97.6÷0.02=
8.8-（0.25+0.4）= 0.25+87+0.75= 0.8-0.35×2=
0.1÷0.01×0.1= 9.9+9.9×99= 2.7×3.6+6.4×2.7=
720÷8÷9= 2.9+5.7+2.1= 2-0.16-0.64=
16.7+84.5-16.7= 6.8-（3.8+2.9）= 9×1.3+9×6.7=
5.5-5.25+5.2= 0.8×25-10= 42.8×25×4=
7.2+2.8= 0.9÷0.01= 3.5+7.6=
3×0.2×0.5= 0.96÷0.3= 1.5×0.4=
7÷0.25= 2.5×0.7×0.8= 8-2.5=
16÷1.6= 5.6×1.01= 8×（2.5+0.25）=
0.36+0.64= 64.32÷16= 72.8÷0.8=
8.4×0.2+1.6×0.2= 8.4÷4.2= 0.05×0.8=
2.56-0.37= 1.23×3= 25×0.8×0.5=
12×2.5= 3.2÷1.6= 3.5+3.5×3=
19.6÷2= 8.8÷2.2= 3.9+2.03=
7.2×0.3+2.8×0.3= 13.8+9.9= 2.4×2.5=
0.75×4= （1.5+0.25）×4= 4.2÷0.1=
4.2÷3.5= 2.14-0.9= 27+456+73=
12÷0.3= 2.87÷0.7= 13÷4=
24÷4+56÷4= 2.1×0.3÷2.1= 2.3-0÷8.1=
1.37-1.37÷1.37= 4.4÷（5×0.2）= 7×1.3=
0.96÷0.06= 0.36×0.3= 0.35÷0.7=
13.65÷13= 4×0.8×0.25×1.25= 13+0.7÷0.7=
7.05×23.7+7.05×76.3= 0.125×3.2×2.5= （12+23.1÷0.75）×0.4-5.12=
728+199= 637-201= 16×25=
1.6×[（12-7.2）÷（0.84÷2.1）]=
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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