问题 解答题
解比例.
1.5:12=6:x
x:
3
5
=
5
6
:2
1.3
3.9
=
20
x
x:
24
7
=0.875:5
2
3
5
6
=x:0.5
x
0.15
=
0.4
0.03
答案

(1)1.5:12=6:x,

1.5x=12×6,

1.5x=72,

1.5x÷1.5=72÷1.5,

x=48;

(2)x:

3
5
=
5
6
:2,

2x=

3
5
×
5
6

2x=

1
2

2x÷2=

1
2
÷2,

x=

1
4

(3)

1.3
3.9
=
20
x

1.3x=20×3.9,

1.3x=78,

1.3x÷1.3=78÷1.3,

x=60;

(4)x:

24
7
=0.875:5,

5x=

24
7
×0.875,

5x=3,

5x÷5=3÷5,

x=0.6;

(5)

2
3
5
6
=x:0.5,

5
6
x=
2
3
×0.5,

5
6
x=
1
3

5
6
5
6
=
1
3
÷
5
6

x=

2
5

(6)

x
0.15
=
0.4
0.03

0.03x=0.15×0.4,

0.03x=0.06,

0.03x÷0.03=0.06÷0.03,

x=2.

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