题目内容

1
3
：0.05=1
7
9
：x．
分析：根据比例的基本性质，把原式转化为
1
3
x=0.05× 1
7
9
，再根据等式的性质，在方程两边同时乘上3解答．
解答：解：
1
3
：0.05=1
7
9
：x，
       
1
3
x=0.05× 1
7
9
，
    
1
3
x×3=
4
45
×3，
          x=
4
15
．
点评：本题考查了学生根据比例的基本性质和等式的性质解方程的能力，注意等号对齐．
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相关题目
直接写出得数：
1
3
+
1
2
=
5
6
5
6
；		 4
6
7
-
1
7
=
4
5
7
4
5
7
；		 1÷0.05=
20
20
；
(
1
6
+
1
4
)×12=
5
5
；		 4÷9×
4
9
=
16
81
16
81
；
3
4
×
4
3
÷
3
4
×
4
3
=
16
9
16
9
．
（2012?陆良县模拟）计算下面各题，能简算的要简算．
（1）1
5
13
×9+1
5
13
×17
（2）12
1
2
×3.5×
2
35

（3）
5
16
×1
1
3
×
3
5
÷
2
15

（4）[5
4
15
-(0.25+
1
3
)×7.2]÷2
4
5

（5）(3
5
6
-1
3
4
)×2
2
5
÷4
1
2

（6）2
1
4
÷[(2
1
3
-1.2)×
3
4
+0.05]．
4.7+2.3= 4.5×2= 6.9-2.5= 7.2×0.8=
6×3.4= 0.62-0.32= 1.4×0.5= 0.75×100=
0.02×0.5= 3.6÷0.3= 6.3÷7= 5.6÷100=
0.75÷0.25= 0.125×8= 4.8÷0.3= 0.96÷2=
0.56÷28= 0.36÷0.4= 0.64÷0.8= 0.72÷3.6=
3.6÷24= 0.8×1.1= 7.2+12.8= 46.7-3.8=
12.8÷4= 5.2÷13= 12.5÷5= 1.64÷41=
10÷20= 24÷15= 8.65×10= 0.35×0.6=
3.08×0.01= 4.95×1000= 6.9×0.1= 0.4×0.5=
2.4÷0.8= 10.8÷9= 9.6÷0.8= 0.108÷2=
4.95÷0.9= 9.65÷0.1= 0.325×100= 2.5×8=
0.56÷0.7= 0.125×4= 3.28×0.1= 3.9÷0.13=
7.2×0.1= 0.01×0.1= 0.25×0.4= 1.6÷0.8=
1÷2.5= 1.25×0.8= 3.2÷0.04= 0÷1.7=
0.22×102= 9.6÷0.8= 5×0.24= 4.5-0.05=
3.9÷0.13 16.5÷0.5= 5×0.12= 24×0.5=
4.8×0.5= 2.8+4.2= 0.84÷2.1= 5÷0.25=
7.8÷0.01= 5.4÷0.6= 3.2÷5= 7×0.62=
0.56÷0.8= 7.4-2.8= 0.18÷0.2= 0.16÷8=
4.5×0.02= 8+7.2= 1.2×30= 0.012×0.2=
7.3×0.3= 9÷6= 3.6÷0.12= 7.8÷0.6=
2÷5= 4.5+5= 0.3÷0.6= 0.96÷0.2=
10.5×0.4= 7.3+0.27= 8×0.125= 0.54÷0.6=
0.61+0.39= 0.56÷28= 10÷20= 4.08÷0.4=
11-9.4= 0.8×0.11= 0.72+12.8= 5.6÷0.01=
2.3×100= 0.75×100= 0.108÷2= 10.8÷9=
0.7÷0.8= 16-5.07= 4.2×0.4= 0.72×6=
12÷0.5= 5.2×0.4= 12.2÷0.2= 5.6÷100=
0.41+3.7= 0.02×0.5= 7.2-0.8= 1.4×0.5=
84÷0.21= 0.75÷0.25= 2.5×16= 0.108÷2=
1.75+32.5= 16-5.07= 5.2÷13= 1.64÷41=
1.02×0.2= 0.26×0.3= 8.4×0.02= 1.29×6=
0.8×0.05= 12.6÷0.03= 8.71÷0.1= 21÷0.21=
0.8×0.13= 0.34÷17= 8.08÷0.4= 0.5×2.2=
1.24÷4= 3.27+0.63= 5.02×0.3= 0.3×0.5=
6.4÷4= 7.2÷1.8= 0.7÷0.35= 0.72÷1.44=
0.48÷0.04= 1.25÷2.5= 5.5+55= 16.8÷8=
0.54+2.2= 3.5-0.05= 2÷0.02= 0.25×40=
1.5×0.6= 0.32÷0.8= 12.25÷0.5= 73.5×0.1=
46.5+52.5= 0.45×102= 1.25×88= 2.64+3.85+1.54=
8×1.25= 5.6÷3.5= 4.2÷0.7÷6= 0.4×8.6×25=
0.27÷0.3= 2.5×101= 0.65×101-0.65= 2.6×7÷2.6×7=
450-140= 25÷7= 900+238= 600-9×8=
90-7×5= 26+30-28= 48÷（2+4）= 780-772=
26+24= 80-30= 78-26=
5
6
-
1
2
=
(
1
2
+
1
3
+
1
4
) × 24=		 0.25×2.69×4= 10-2.87-7.13=
12
7
÷24=
3÷
4
5
=		 0.87-0.49 4.9×0.7=
4
5
÷
7
10
=
8
5
 ÷
5
8
=
7
18
÷
5
9
=
1
2
×
1
5
=		 2+
4
9
=
（25+4）×4= 12.37-3.25-6.75= 3/14×6= 0.51÷17=
14-7.4= 5.2÷1.3= 25×12=
3
16
÷
3
16
=
9
26
÷
8
13
=		 2.5-2= 36-29= 120÷4=
300+25= 630-30= 4×50= 15.9+10.8=
26×13= 24÷4+56÷4= 8-2.5= 12×2.5=
2吨50千克=
2.05
2.05
吨．
3
4
×2=
1
6
+
1
2
=
5
9
÷5=
1
12
×
6
7
=
3
4
÷3=
5
4
×
5
4
=
5
8
÷1=		 5-
2
3
=
3
9
×12=
3
5
×
5
12
=		 4-
2
3
=
7
12
×3=
2
7
÷14=		 8+
3
5
=		 0×
13
30
=		 39×
3
13
=
8×
1
2
=
5
6
÷
3
4
=		 4×
12
7
=		 20÷
4
5
=
1-
9
10
=		 2.5×16=
5
12
÷
1
6
=
3
2
×
4
5
=
8
15
÷24=		 11÷
22
8
=
1
2
÷
3
8
=
4
7
÷
2
3
=
3
4
+
1
7
=		 1.5÷0.05= 0×
1
9
×9=		 1.5÷0.05=
5
8
÷
7
12
=
4
5
×
2
3
×
5
6
=
5
9
×
2
5
=		 2.5×0.4=
14×
5
16
=		 (
1
2
+
1
3
)×12=
14
33
×
3
7
=		 0×
7
9
=
5
8
×
5
8
=
5
21
+
4
7
=
7
9
÷7=		 2-
1
4
=
3
5
-
1
8
=
4
21
÷
8
7
=
2
3
-
1
4
=		 6.25+1.75=
1
2
÷
7
18
=
9
10
×6=
1
8
+
1
9
=
3
4
÷
4
3
=
1
2
×
2
3
=		 12-
5
7
=		 1÷
2
5
=
2
9
÷18=
7
28
÷
2
9
=		 10×1×
2
5
=		 20÷
4
5
=
1
3
×9+9×
2
3
=
42÷
21
23
=
3
8
÷12=

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