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3
4
÷
3
4
=
 
  
2.4×
3
8
=
 
  
5
9
÷
6
9
=
 
   
7-
9
7
=
 
5
7
×
14
15
=
 
  
1
3
-
1
4
=
 
5
7
+
3
8
)×56=
 
  
3
14
=
 
10÷10%=
 
   
1
8
+
1
4
)×16=
 
  
7
8
×6÷
7
8
=
 
  
2
5
+6×
3
5
=
 
1
6
×6÷
1
6
×6=
 
 
1
4
-
1
10
)×20=
 
 
(3.6+
9
10
)÷9=
 
   
3
8
+
3
4
)×8=
 
分析:(1)一个数除以本身等于1;(2)约分计算;(3)(11)(13)把除法改为乘法,约分计算;(4)把整数化为分数计算;(5)约分计算;(6)(8)通分计算;(7)(10)(12)(14)(16)运用乘法分配律简算;(9)把百分数化为小数计算;(15)把除法改为乘法,运用乘法分配律简算.
解答:解:
3
4
÷
3
4
=1 
2.4×
3
8
=0.9
5
9
÷
6
9
=
5
6
7-
9
7
=
40
7
5
7
×
14
15
=
2
3
 
1
3
-
1
4
=
1
12
5
7
+
3
8
)×56=61 
3
14
=
3
2
10÷10%=100  
1
8
+
1
4
)×16=6 
7
8
×6÷
7
8
=6 
2
5
+6×
3
5
=6
1
6
×6÷
1
6
×6=36
1
4
-
1
10
)×20=3
(3.6+
9
10
)÷9=
1
2
   
3
8
+
3
4
)×8=9
故答案为:1,0.9,
5
6
40
7
2
3
1
12
,61,
3
2
,100,6,6,6,36,3,
1
12
,9.
点评:此题考查了四则混合运算,注意运算顺序和运算法则,以及约分、通分、乘除法的转化.
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