问题 解答题
解比例
0.6:4.8=12:X
2
3
1
4
=1.2:X
45:X=18:26
9:0.09=X:0.15x:
1
20
=
3
4
1
5
(3.8-x):7=2:7
0.8
X
=
7
5
x:
5
7
=0.3:
5
14
1.6
6
=
X
2.4
0.375:X=
1
20
:60%
X:5=
18
30
1
2
1.4
x
=
0.4
15
2
5
:X=0.25:6
0.45:X=
2
7
:20
1.25:0.25=X:1.6
X:48=3:1.2
7
8
:X=1:0.25
1.6
X
=
2.5
5
12:5=3.6:XX:0.25=4:31.5:X=3.6:4.8
6.5:X=3
1
4
:4
0.6:1
1
5
=
4
5
:X
1.5:
3
4
=0.36:X
0.75:X=1
1
4
:2
3.6:X=0.48:
3
25
1.25:0.2=X:1
3
5
答案

(1)0.6:4.8=12:X,

0.6X=4.8×12,

0.6X÷0.6=57.6÷0.6,

X=96;

(2)

2
3
1
4
=1.2:X,

2
3
X=
1
4
×1.2,

2
3
2
3
=0.3÷
2
3

X=0.45;

(3)45:X=18:26,

18X=45×26,

18X÷18=1170÷18,

X=65;

(4)9:0.09=X:0.15,

0.09X=0.15×9,

0.09X÷0.09=1.35÷0.09,

X=15;

(5)x:

1
20
=
3
4
1
5

1
5
x:=
1
20
×
3
4

1
5
x÷
1
5
=
3
80
÷
1
5

x=

3
16

(6)(3.8-x):7=2:7,

(3.8-x)×7=2×7,

(3.8-x)×7÷7=14÷7,

3.8-x=2,

3.8-x+x=2+x,

3.8=2+x,

3.8-2=2+x-2,

x=1.8;

(7)

0.8
X
=
7
5

7X=0.8×5,

7X÷7=4÷7,

X=

4
7

(8)x:

5
7
=0.3:
5
14

5
14
x=
5
7
×0.3,

5
14
x÷
5
14
=
3
14
÷
5
14

x=

3
5

(9)

1.6
6
=
X
2.4

6X=1.6×2.4,

6X÷6=3.84÷6,

X=0.64;

(10)0.375:X=

1
20
:60%,

1
20
X=0.375×60%,

1
20
X÷
1
20
=
9
40
÷
1
20

X=

9
2

(11)X:5=

18
30
1
2

1
2
X=5×
18
30

1
2
X÷
1
2
=3÷
1
2

X=6;

(12)

1.4
x
=
0.4
15

0.4x=1.4×15,

0.4x÷0.4=21÷0.4,

x=52.5;

(13)

2
5
:X=0.25:6,

0.25X=

2
5
×6,

0.25X÷0.25=2.4÷0.25,

X=9.6;

(14)0.45:X=

2
7
:20,

2
7
X=0.45×20,

2
7
X÷
2
7
=9÷
2
7

X=31.5;

(15)1.25:0.25=X:1.6,

0.25X=1.25×1.6,

0.25X÷0.25=2÷0.25,

X=8;

(16)X:48=3:1.2,

1.2X=48×3,

1.2X÷1.2=144÷1.2,

X=120;

(17)

7
8
:X=1:0.25,

X=0.25×

7
8

X=

7
32

(18)

1.6
X
=
2.5
5

2.5X=1.6×5,

2.5X÷2.5=8÷2.5,

X=3.2;

(19)12:5=3.6:X,

12X=5×3.6,

12X÷12=18÷12,

X=1.5;

(20)X:0.25=4:3,

3X=0.25×4,

3X÷3=1÷3,

X=

1
3

(21)1.5:X=3.6:4.8,

3.6X=1.5×4.8,

3.6X÷3.6=7.2÷3.6,

X=2;

(22)6.5:X=3

1
4
:4,

3

1
4
X=4×6.5,

3

1
4
X÷3
1
4
=26÷3
1
4

X=8;

(23)0.6:1

1
5
=
4
5
:X,

0.6X=1

1
5
×
4
5

0.6X÷0.6=

24
25
÷0.6,

X=

8
5

(24)1.5:

3
4
=0.36:X,

1.5X=

3
4
×0.36,

1.5X÷1.5=0.27÷1.5,

X=0.18;

(25)0.75:X=1

1
4
:2,

1

1
4
X=2×0.75,

1

1
4
X÷1
1
4
=1.5÷1
1
4

X=1.2;

(26)3.6:X=0.48:

3
25

0.48X=3.6×

3
25

0.48X÷0.48=0.432÷0.48,

X=0.9;

(27)1.25:0.2=X:1

3
5

0.2X=1.25×1

3
5

0.2X÷0.2=2÷0.2,

X=10;

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