题目内容

看谁算得又准又快．
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：根据分数、小数加减乘除法的计算法则进行口算；其中37.2×99+37.2运用乘法分配律进行简算；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
故答案为：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．
点评：明确分数、小数加减乘除法的计算法则，是解答此题的关键．
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看谁算得又准又快．
2
1
4
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9
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3
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4
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5
7
=
4
27
×
9
16
=		 2-
2
3
×2=
1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
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3
8
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4
5
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3
2
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7
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看谁算得又准又快．
10-0.9=		 8.2+0.54+0.46=
4
5
-
1
3
=
7
15
11
12
-
5
6
+
1
12
=
3
8
×
2
5
=		 26.26÷26= 4.57+6.43= 7.9×11-7.9=
3.14×32= 3+
3
4
-3+
3
4
=		 10.1×30= 2÷0.2-2=
3
4
×
3
8
=		 1.8×4×0.5= 1.5-1.5×0.2= 578+216=
85.2-3.25= 3.2-
1
2
=
2
9
×81=
1
2
+
1
3
=
看谁算得又准又快．
13×（2+
7
13
）=		 341-103= 24.06+0.4=
3
8
-
1
3
=		 （
5
6
-
1
5
）×30=
4
5
×25=
1
12
×6=		 2.8×25+12×2.5= 12.5×32×2.5=
3
5
×1=

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