题目内容

解方程或比例:
x:
3
8
=
2
3
:4
x
9
=
0.8
4.5
3:x=9:15
x
25
=
1.2
75
1
3
1
4
=
1
5
:x.

(1)x:
3
8
=
2
3
:4,
4x=
3
8
×
2
3

4x=
1
4

4x÷4=
1
4
÷4,
x=
1
16


(2)
x
9
=
0.8
4.5

4.5x=9×0.8,
4.5x=7.2,
4.5x÷4.5=7.2÷4.5,
x=1.6;

(3)3:x=9:15,
9x=3×15,
9x=45,
9x÷9=45÷9,
x=5;

(4)
x
25
=
1.2
75

75x=25×1.2,
75x=30,
75x÷75=30÷75,
x=0.4;

(5)
1
3
1
4
=
1
5
:x,
1
3
x=
1
4
×
1
5

1
3
x=
1
20

1
3
1
3
=
1
20
÷
1
3

x=
3
20
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