问题 解答题
解比例:
9:5﹦4.5:x;
1
10
:x﹦
1
8
1
4
28
x
0.4
0.1
1
60
1
45
﹦x:8;
x:
3
5
﹦51:17;
6
x
5
6
1
3
答案

(1)9:5﹦4.5:x,

9x=5×4.5,

9x÷9=22.5÷9,

x=2.5;

(2)

1
10
:x﹦
1
8
1
4

1
8
x=
1
10
×
1
4

1
8
x×8=
1
40
×8,

x=

1
5

(3)

28
x
0.4
0.1

0.4x=28×0.1,

0.4x÷0.4=2.8÷0.4,

x=7;

(4)

1
60
1
45
﹦x:8,

1
45
x=
1
60
×8,

1
45
x×45=
2
15
×45,

x=6.

(5)x:

3
5
﹦51:17,

17x=

3
5
×51,

17x÷17=

153
5
÷17,

x=1

4
5

(6)

6
x
5
6
1
3

5
6
x=
1
3
×6,

5
6
6
5
=2×
6
5

x=2.4.

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