题目内容

看谁算得又准又快．
2
1
4
×2=		 0.99×9+0.99=
9
4
×
1
27
=		 1
1
2
×8+1
1
2
×2=
82.5-3.25=
7
10
÷7=		 3005-899= 7.25+2.75=
9.8÷98= 0.125×9×8=
1
3
-
1
4
=		 5-
5
7
=
4
27
×
9
16
=		 2-
2
3
×2=
1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
=		 12-
3
8
=
4
5
×
3
2
=
2
7
×2=
分析：分数乘整数，用分子和整数相乘的积作分子，分母不变，能约分的要先约分；除以一个数（0除外），就等于乘这个数的倒数；分数乘分数，分子和分子相乘的积作分子，分母和分母相乘的积做分母，能约分的要先约分；再据分数四则混合运算的顺序即可进行解答；据此解答即可求解．
解答：解：

2
1
4
×2=4
1
2
 0.99×9+0.99=9.9
9
4
×
1
27
=
1
12
 1
1
2
×8+1
1
2
×2=15
82.5-3.25=79.25
7
10
÷7=
1
10
 3005-899=2106 7.25+2.75=10
9.8÷98=0.1 0.125×9×8=9
1
3
-
1
4
=
1
12
 5-
5
7
=4
2
7
4
27
×
9
16
=
1
12
 2-
2
3
×2=
2
3
1
2
-
1
6
=
1
3
3
5
+
4
5
=1
2
5
3
4
+
1
5
=
19
20
 12-
3
8
=11
5
8
4
5
×
3
2
=1
1
5
2
7
×2=
4
7
点评：此题主要依据分数乘法和乘法的运算法则，以及求分数四则混合运算的顺序．
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看谁算得又准又快．
2
3
÷
4
15
=
2
1
2
2
1
2
4
7
÷
1
14
=
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÷
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1
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8
15
÷
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35
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1
1
6
1
1
6
5
9
÷3=
5
27
5
27
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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
．
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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