看誰算得又準(zhǔn)又快.
2
3
÷
4
15
=
2
1
2
2
1
2
4
7
÷
1
14
=
8
8
4
27
÷
8
9
=
1
6
1
6
8
15
÷
16
35
=
1
1
6
1
1
6
5
9
÷3=
5
27
5
27
30÷
3
8
=
80
80
16
35
÷
4
7
=
4
5
4
5
5
18
÷
12
27
=
5
8
5
8
3÷0.5=
6
6
          
10÷25=
0.4
0.4
         
4.8÷0.16=
30
30
       
0÷3.89=
0
0
3.52÷1=
3.52
3.52
      
37.2×99+37.2=
3720
3720
 
6.4÷4﹦
1.6
1.6
     
1.5÷0.3﹦
5
5
1×0.4÷1×0.4=
0.16
0.16
  
1.8×5﹦
9
9
 
7.2÷0.9﹦
8
8
    
25×4÷0.25×4=
1600
1600
分析:根據(jù)分?jǐn)?shù)、小數(shù)加減乘除法的計算法則進行口算;其中37.2×99+37.2運用乘法分配律進行簡算;25×4÷0.25×4=25÷0.25×4×4=1600.
解答:
解:
2
3
÷
4
15
=2
1
2

4
7
÷
1
14
=8

4
27
÷
8
9
=
1
6
8
15
÷
16
35
=1
1
6
5
9
÷3=
5
27
30÷
3
8
=80
16
35
÷
4
7
=
4
5
5
18
÷
12
27
=
5
8
3÷0.5=6
10÷25=0.4 4.8÷0.16=30 0÷3.89=0
3.52÷1=3.52 37.2×99+37.2=3720 6.4÷4﹦1.6
1.5÷0.3﹦5 1×0.4÷1×0.4=0.16 1.8×5﹦9
7.2÷0.9﹦8 25×4÷0.25×4=1600
故答案為:2
1
2
,8,
1
6
,1
1
6
,
5
27
,80,
4
5
,
5
8
,6,0.4,30,0,3.52,3720,0,5,0.16,9,8,1600.
點評:明確分?jǐn)?shù)、小數(shù)加減乘除法的計算法則,是解答此題的關(guān)鍵.
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