看誰(shuí)算得又準(zhǔn)又快.
1
2
-
1
3
=
1
6
1
6
7
16
×
16
7
=
1
1
3.6÷0.06=
60
60
2
21
-
2
21
=
2
3
2
3
1
4
÷
1
4
=
1
1
15÷
3
5
=
25
25
4
9
×
9
16
÷
7
16
=
4
7
4
7
1
2
+0.5)×(
1
2
-0.5)=
0
0
2.2×6﹦
13.2
13.2
    
8.4÷0.4﹦
21
21
      
9÷5-4÷5﹦
1
1
       
4.5÷0.9﹦
5
5
2.5×4﹦
10
10
     
 25×3.3×0﹦
0
0
      
25×40﹦
1000
1000
       
0.3÷0.1﹦
3
3
4.5×2=
9
9
       
4÷4%=
100
100
        
7.8+0.22=
8.02
8.02
       
2-0.64-0.36﹦
1
1
分析:
1
2
+0.5)×(
1
2
-0.5),25×3.3×0根據(jù)任何數(shù)乘上0都得0計(jì)算;
2
21
-
2
21
運(yùn)用乘法分配律簡(jiǎn)算;
2-0.64-0.36根據(jù)減法的性質(zhì)簡(jiǎn)算;
其它題目根據(jù)運(yùn)算法則直接求解.
解答:解:
1
2
-
1
3
=
1
6
7
16
×
16
7
=1
3.6÷0.06=60
2
21
-
2
21
=
2
3
1
4
÷
1
4
=1
15÷
3
5
=25
4
9
×
9
16
÷
7
16
=
4
7
1
2
+0.5)×(
1
2
-0.5)=0
2.2×6﹦13.2    
8.4÷0.4﹦21       9÷5-4÷5﹦1        4.5÷0.9﹦5
2.5×4﹦10       25×3.3×0﹦0       25×40﹦1000       
0.3÷0.1﹦3 4.5×2=9        4÷4%=100        
7.8+0.22=8.02        2-0.64-0.36﹦1.
故答案為:
1
6
,1,60,
2
3
,1,25,
4
7
,0,13.2,21,1,5,10,0,1000,3,9,100,8.02,1.
點(diǎn)評(píng):口算題目要求快速準(zhǔn)確,能運(yùn)用簡(jiǎn)算方法的要簡(jiǎn)算.
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